AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!

AP Spanish Literature and Culture Terms Flashcards

Terms : Hide Images
13249362632alegoríaRelato que ilustra una idea o moraleja y cuyos objetos tienen significado simbólico. Ejemplo la calavera representa la muerta.0
13249362646Apologiá1
13249362633desdoblamientoseparación de una cosa a dos partas, como una manifestasción de dos o más personalidades de una persona.2
13249362634leitmotivola repetición, en una obra literaria, de una palabra, frase, situación o idea, con el fin de dar un sentido de unidad al conjunto.3
13249362635metaficciónel autor rompe la ilusión de realidad por referir a la irrealidad de la obra.4
13249362636meta-teatrouna técnica de "teatro dentro del teatro" que enfatiza que el mundo es un gran teatro y los seres humanos somos personajes que desempeñamos cierto papel.5
13249362637parodiaImitación de una obra con fin de ridiculizarla.6
13249362638narrativa en primera personaEn que el narrador uso la primera persona para relata las acciones de la obra7
13249362639narrativa epistolarNarrativa en forma de cartas escritas por uno o varios personajes; permite presentar varios puntos de vista y prescindir del narrador omnisciente.8
13249362640narrador fidedignoNarrador digno de confianza, cuyo entendimiento de los personajes o las acciones del relato lo acredita para contar los hechos. Se ajusta a las normas que establece el autor implícito.9
13249362641narrador no fidedignoUn narrador "no digno de confianza," que describe la acción con sus propios opiniones?10
13249362642narrador testigoNarrador que no participa en la acción pero relata los hechos en primera persona y hace comentarios.11
13249362643NarratorioPersonaje o personajes a los que se dirige el narrador de un texto.12
13249362644parábolaRelato breve didáctico cuya acción se refiere, o es aplicable, a otra situación.13
13249362645caricaturadibujo donde se exagera o deforma algún aspecto físico de alguien o algo14
13264662264AnáforaRepetición de palabras en una sucesión de versos o enunciados. Ejemplo cuando se repite en un poema la misma palabra en un verso.15
13264676159estribilloverso o versos que se repiten de forma periódica en un poema, por lo general de arte menor, y que frecuentemente encierra la idea principal. Ejemplo: ¡Ay de mi Alahama!16
13264978683apóstrofe17
13307273188CromatismoEl uso de colores para expresar ideas y sentimientos.18
13312480886AntítesisContraposición de palabras, frases o ideas de significado opuesto.19

AP Bio Flashcards

Terms : Hide Images
13854483491created the binomial naming system of classificationCarolus Linnaeus0
13854489644Paleontology, catastrophismGeorges Cuvier1
13854494754earth's geologic features formed gradually over time; uniformitarianismHutton and Lyell2
13854540785-use and disuse, inheritance of acquired characteristics - organisms have an innate desire to become more complex/perfectJean- Baptiste de Lamarck3
13854558335structures that are descended from common ancestor that no longer serve a function (ex: appendix)Vestigial Structure4
13854570820independent evolution of similar features in different lineages (no common ancestor)Convergent Evolution5
13854589716results from convergent evolution and are similar features adapted for similar functions in similar environments but don't come from common ancestorAnalogous structures6
13854609095similarity resulting from common ancestry; structurally similar but could be functionally differentHomology7
13854618657anatomical resemblances that represent variations on a structural theme present in a common ancestorHomologous Structures8
138546445901. No mutations 2. Random mating 3. No natural selection 4. Extremely large population size 5. No gene flowConditions for Hardy Weinberg Equilibrium9
138546707651. 640 red eyes and 360 sepia 2. 16%?In a pop. of 1000 fruit flies, 640 have red eyes. The remainder have sepia eyes. Sepia eye color is recessive to red eye color. 1. What are the frequencies of the red and sepia alleles in this pop? 2. How many would you expect to be homozygous for red eye color?10
13854703830small populations (ex: wildflowers trampled by moose)Genetic Drift is most common in?11
13854713337a few individuals become isolated from a larger pop. by chance and establish a new population whose gene pool differs from the source populationGenetic Drift: Founder Effect12
13854735219a severe drop in pop. size due to a sudden change such as a fire or flood. Allele frequencies in the surviving population may not represent the source pop. by chance aloneGenetic Drift: the bottleneck effect13
13854754469transfer of alleles into or out of a population due to the movement of fertile individuals or their gametes-makes species more similarGene flow14
13854772055conditions favoring one extremeDirectional Selection15
13854794016conditions favor individual at both extremes of a phenotypic range over individuals with intermediate phenotypesDisruptive Selection16
13854812736Acts against both extreme phenotypes and favors intermediate variantsStabilizing Selection17
13854823085difference between the two sexes in secondary sexual characteristics (ex: peacocks)-type of sexual selectionsexual dimorphism18
13854841648intrasexual- individuals of one sex compete directly for mates (usually among males) Intersexual- mate choice; individuals of one sex are choosy in selecting their mates from the other sexIntrasexual vs. intersexual sexual selection19
13854871277Atoms of an element that have different numbers of neutronsIsotopes20
13854887908loss of electronsoxidation21
13854890198gain of electronsreduction22
13854909265hydrogen bondforms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom23

AP Human Geography: Language Flashcards

Language

Terms : Hide Images
12171462440Indo European language familyLargest language family Includes English and most other languages in the Western Hemisphere Also used in South and Southwest Asia. Includes the Germanic branch, Indo-Iranian branch, Balto-Slavic branch, and Romance branch.0
12171462441Sino-Tibetan Language Family2nd largest language family. Includes Mandarin, Thai, Cantonese and Burmese1
12171462456EbonicsA dialect of English spoken by some African Americans.2
12171462458FrancophonePlaces and countries where French is spoken around the world. (Quebec in Canada, Vietnam, Haiti, Sub-Saharan Africa, Belgium, Switzerland, France).3
12171462460Romance BranchA language branch of the Indo-European Language Family. This branch includes languages that evolved from Latin (the language of the Romans). The 5 main languages include: Spanish, Portuguese, French, Italian, and Romanian.4
12171462461Germanic BranchA language branch of the Indo-European Language Family. Divided into North and West Germanic. North Germanic includes Scandinavian languages (Swedish, Danish, Norwegian, Icelandic), which all came from Old Norse. West Germanic is further divided into High Germanic and Low Germanic subgroups. High German includes the standard German language. Low German includes English, Dutch, Flemish (Dialect of Dutch), Afrikaans, and Frisian.5
12171462462Indo-Iranian BranchThe branch of the Indo-European language family with the most speakers. This branch includes more than 100 individual languages divided into an eastern group (Indic), which includes the languages of Hindi and Urdu and a western group (Iranian), which includes Farsi and Kurdish.6
12171462463Balto-Slavic BranchThis branch of the Indo-European language family can be broken down into four groups: East Slavic (Russian, Ukrainian, Belarusian), Baltic (Latvian, Lithuanian), West Slavic (Polish, Czech, and Slovak), and South Slavic (Serbo-Croatian). Russian is the most widely used language in this branch, due to the spread of the Soviet Union.7
12171462464Celtic BranchA language branch of the Indo-European Language Family. This branch includes the languages of the British Isles before the invasion of the Angles, Saxons, and Jutes. This branch is divided into two language groups: Goidelic (Gaelic), which includes Irish Gaelic and Scottish Gaelic, and Brythonic, which includes Welsh, Breton, and Cornish. These languages declined because the Celts lost most of their territory and the English colonizers forbid the use of the Celtic languages.8
12171462465Uralic Language FamilyLanguage Family in Europe that includes the languages of Estonian, Finnish, and Hungarian. Languages in this family originated from the Ural mountains in Russia, spreading through migration.9
12171462466Austronesian Language FamilyLanguage Family spoken mostly in Indonesia. This family includes the languages of Javanese, Indonesian, Malay, and Malagasy. The most spoken language in this family is Javanese, since Java is the populous island of Indonesia. The Indonesian language is used as a lingua franca in Indonesia, due to so many different native languages (739 active languages). Malay is spoken in Malaysia, Malagasy is spoken in Madagascar.10
12171462467Afro-Asiatic Language FamilyThis language family is found in northern Africa and southwestern Asia (Middle East), where Islam is the dominant religion. This family includes the languages of Arabic and Hebrew. Hebrew is spoken in Israel, a Jewish state, and Arabic is spoken throughout the region since it is the language of the Koran, the Islamic holy book.11
12171462468Niger-Congo Language FamilyMore than 95% of people in Sub-Saharan Africa speak languages from this family. This family includes Swahili, the lingua franca in Africa, used by many to communicate as a second language, due to so many different native languages.12
12171462469Prehistoric SubgroupA language that predates the current language family, before the written record. Ex: Proto-Indo-European13
12171462470Altaic Language FamilyA language family spoken across central Asia named after the Altai Mountains. The most spoken language in this family is Turkish. The family also includes the languages spoken in the Caucasus Region and across Central Asia, previously controlled by the Soviet Union. With the collapse of the Soviet Union, newly independent countries in these regions reverted to their native languages in this family, including the countries of Azerbaijan, Kazakhstan, Kyrgyzstan, Turkmenistan, Uzbekistan, Mongolia and Georgia.14
12171462471Kurgan TheoryProposed by Marija Gimbutas, this theory argues the Proto-Indo-European language diffused by military conquest as nomadic herders on horseback (Kurgans) invaded west from the Asian Steppe ( border between Russia and Kazakhstan) around 4300 B.C in search of grasslands.15
12171462472Renfrew (Anatolian) TheoryProposed by Colin Renfrew, this theory argues the Proto-Indo-European language diffused by way of agricultural practices from Anatolia (Turkey) in 6300 BC.16
12171462479HindiApproximately one-third of Indians, mostly in the north, use this Indic language. This language can be spoken in many different ways, but there is only one official way to write the language, using a script called Devanagari. It serves as the lingua franca in India and is used by the government, growing into a national language in the nineteenth century when the British encouraged its use in government. It is part of the Indo-Iranian branch.17
12171462480SwahiliThe lingua franca in Africa, used by many to communicate as a second language, due to so many different native languages. This language was developed between African and Arab traders and is one for the few African languages with extensive literature. It is part of the Niger-Congo language family.18
12171462481UrduPakistan's principal language, spoken very much like Hindi but written with the Arabic alphabet, a legacy of the fact that most Pakistanis are Muslims, and their holiest book (the Quran) is written in Arabic. It is part of the Indo-Iranian branch.19
12171462482FarsiThe principle language of Iran, a remnant of the Persian Empire. It is written with the Arabic alphabet since Iran is a Muslim country. This language is part of the Indo-Iranian branch.20
12171462483MandarinThis language is the most spoken language in the world. It is spoken by approximately three-fourths of the Chinese people, and is used by the Chinese government. There is no single Chinese language. Instead of letters, Chinese languages use ideograms (characters) that mostly represent concepts rather than sounds.21
12171462484ArabicThis language serves as a unifying force in the Middle East (Northern Africa and Southwest Asia), typically referred to as the Arab World. This language is the language of Islam (used in the Koran),, which is predominant throughout the region. This language belongs to the Afro-Asiatic language family and is the official language in two dozen countries of North Africa and southwestern Asia, from Morocco to the Arabian Peninsula.22
12171462485HebrewThis language was an extinct language that has been revived. It diminished in use in the fourth century B.C. and was thereafter retained only for Jewish religious services. When Israel was established in 1948, this language became one of the new country's two official languages, along with Arabic. This language was chosen to unify the Jews of Israel and give them a sense of nationalism, since Israel was created by Jewish refugees and migrants who spoke many different languages. Reviving this language required the creation of many new words for the modern world.23
12171462486Irish GaelicThis is one of the two official languages of Ireland, along with English. Branches off from Indo-European branch This language was forbidden under English rule. When Ireland got their independence form England in 1922, this language became an important part of their cultural identity and sense of nationalism and became a compulsory course in all public schools and required for public service jobs.24
12171462487BasqueAlso known as Euskera, this isolated language predates the Indo-European language and is not related to any other language family in Europe. Spoken in the Pyrenees Mountains (between Spain and France), the mountainous homeland created isolation, making the preservation of the language possible.25
12171462488WelshThis is one of the two official languages of Wales, along with English. This language was forbidden under English rule, but has been revived in recent years. This language is a compulsory subject in all schools in Wales and knowledge of the language is now required for many jobs in Wales. Bilingual signs and television and radio programs have also been added to help preserve this language.26
12171462489InuktitutThe language spoken by the Inuits (indigenous tribe) of northern Canada. It is recognized as an official language, along with English and French in Nunavut, the Inuit territory of Canada. Similar to the Celtic languages, it has declined with the forces of globalization and is undergoing a revival since it is an important part of the Inuit culture and is taught in schools and represented on bilingual signs and in the government.27
12171462490GlobalizationThe process by which businesses or other organizations develop international influence and operate on an international scale. Currently, America dominates the world with multinational corporations and media, which has made English the world's current lingua franca (international language of business).28
12171462491QuebecThis province in Canada primarily speaks French, due to its history of colonization. As a result, Canada is officially bilingual, recognizing both English and French as official languages.29
12171462492LatinThe language of the Romans30
12171462493Latin AmericaThis region of the Americas primarily speaks Romance Languages, which derived from Latin. Brazil speaks Portuguese, Haiti and French Guiana speak French, while the majority of the other countries speak Spanish, all due to the patterns of colonization.31
12171462494BelgiumThis multilingual state in Europe, which is part of the francophone world, has experienced tensions between its two language groups. The Flemings live in the north province Flanders and speak Flemish, a Dutch dialect. The Walloons live in the south province Wallonia and speak French. Brussels, the capital city if officially bilingual to create a since of unity in the country. Antagonism between the Flemings and Walloons is aggravated by economic and political differences. Historically, the Walloons dominated Belgium's economy and politics and French was the official state language.32
12171462495SwitzerlandThis multilingual state in Europe, which is part of the francophone world, remains peaceful with four official languages (German, French, Italian, and Romanish). This country has institutionalized cultural diversity by creating a form of government that places considerable power in local, small communities (Decenetralization).33
12186751118Monolingual States and ExampleCountries in which only one language is spoken. Example: Japan, Iceland, Uruguay, Venezuela, Denmark, Portugal, Poland34
12186768840Multilingual States and ExampleCountries in which more than one language is spoken. Examples: Belgium, Switzerland, Nigeria35
12186937679Language ClassificationOfficial and standard36
12191107495Creole Language and ExampleA language derived from a pidgin that has acquired a fuller vocabulary and more formal structure. It becomes the native language of its speakers. Example: Sango, Kinubi, and Haitian Creole37
12191369177lingua francaa common language used by people who do not share the same native language38
12191406693International communicationinteractions among people from different nations lingua francas are used in this interaction39
12191443622pidgin languagea simplified language (simple grammar and limited vocabulary) mutually understood and commonly used in trade by people who have different native languages; this language is usually not the group's primary language40
12191577675Standard languageacceptable form a given language41
12191593960Official languageThe language adopted for use by the government for the conduct of business and publication of documents.42
12191600542language hierarchyFamily, Branch, Group, Language, Dialect43
12191753870Indo-Aryan groupHindi is the largest language from the Indo-Aryan group44
12191761974Iranian groupSpoken in Iran, Central Asia Major languages written in Arabic alphabet Largest spoken language is Farsi, Persian Ex. Persian, Kurdish45
12191851334Isolated languageA language that is unrelated to any other languages and therefore not attached to any language family.46
12191863280LogogramA symbol that represents a word rather than a sound47
12191879227language convergencethe collapsing of two languages into one resulting from the consistent spatial interaction of peoples with different languages48
12191912890language divergenceA process whereby new languages are formed when a language breaks into dialects due to a lack of spatial interaction among speakers of the language and continued isolation eventually causes the division of the language into discrete new languages.49
12191940920Extinct Language and ExampleLanguage without any native speakers. Example: Apalachee50
12191954732Isoglossthe boundaries around an area of space where there are variations in pronunciations or word usage51

Chapter 25 Campbell Biology Flashcards

Terms : Hide Images
13764714798What is the hypothesis about chemical and physical formation of first ever cells?1) abiotic synthesis of small organic molecules 2) those molecules formed macromolecules 3) macromolecules were packed into protocells 4) the origin of self-replicating molecules0
13764740567When did the planet form?4.6 billion years ago1
13764748381Describe the first atmospherelittle oxygen, a lot of water vapor, chemicals released from volcanos (O2, CO2, NH4, H)2
13764764858How did oceans and lakes form in the early history of earth?As earth cooled, the heavy amount of water vapor condensed to form oceans and lakes3
13764789829Hydrothermal ventsspots on the ocean floor where hot gases and minerals escape from earth's interior into the water4
13764794579Alkaline ventsdeep sea vents that release water that has a high pH (9-11) and is warm (40-90ºC) rather than hot5
13764808777How do vesicles exhibit properties of life?these fluid filled compartments form spontaneously and have selective semipermeable membranes6
13764823836Ribozymesenzyme-like RNA catalysts7
13764836167What is meant by "RNA World"?RNA most likely came before DNA RNA is less fragile than DNA and its bonds are stronger and can be replicated more accurately making it more fit for the harsh conditions of early earth8
13764864276Stratalayers of sedimentary rock9
13764864277Radiometric datingthe process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products - expressed by half life10
13764876461Half-lifelength of time required for half of the radioactive atoms in a sample to decay is not affected bu temperature, pressure, or other environmental variables11
13764895572What does Carbon-14 in an organism's dead body slowly decay into?Nitrogen-1412
13764905434Stromatoliteslayered rocket that form when prokaryotes bind thin films of sediment together because prokaryotes came first13
13764923505Where did most of the atmospheric O2 come from? What did this result in?photosynthetic prokaryotes released O2 it dissolved in water to react with iron forming rust and sediments making rocks14
13764943484Oxygen revolutionintense increase in atmospheric O2 that killed many prokaryotes15
13764973280THE Geologic RecordThe division of Earth's history into time periods, grouped into three eons—Archaean, Proterozoic, and Phanerozoic—and further subdivided into eras, periods, and epochs.16
13765052740Endosymbiosisprokaryotic cell engulfed a small cell that would evolve into the mitochondrion (the cell engulfed is the endosymbiont) how eukaryotes became17
13765074567Serial endosymbiosis theory. What is evidence supporting it?theory that mitochondria and plastids originated this way inside what became single organisms of which are thought to have been archaens 1) inner membranes of both organelles are similar to plasma membranes of living bacteria 2) DNA structure and cell division are similar to bacteria 3) both organelles transcribe and translate their own DNA 4) ribosomes are more similar to bacterial than to eukaryotic ribosomes18
13765105970What were the first eukaryotes?Archaebacteria19
13765206356Describe Cambrian explosionsudden appearance of fossils resembling modern animal phyla (however, cnidaria, sponges, and mollusks existed before this) first evidence of predator vs. prey had long fuse20
13765248519When did plants and animals begin to adapt to move from ocean to land?about 500 million years ago21
13765257930What are the most widespread and diverse land animals?arthropods and tetrapods22
13765267328How long ago did the human lineage evolve?6-7 million years ago23
13765284616Over the last billion years, landmasses of earth have formed a super continent multiple times. When were those instances?1 billion, 600 million, and 250 million years ago (Pangaea)24
13765295350Plate tectonics theorythe continents are part of great plates of Earth's crust that essentially float on the hot, underlying portion of the mantle25
13765316096When is the next super continent supposed to form?250 million years from now26
13765331618What are the effect of Pangaea - the supercontinent that formed 250 million years ago?deepening of ocean basins reduction in shallow-water habitat colder and drier climate inland27
13765352032True or False: Continental drift prevents allopatric speciationFALSE: Continental drift promotes allopatric speciation and can justify the distribution os fossils and living groups28
13765380664In each of the FIVE mass extinctions, ___% or more of marine life have vanished50% or more29
13765414619What happened in the Permian extinction and what caused it?in less than 500,000 years, 96% of marine animal species died causes: 1) volcanos in Siberia 2) global warming and ocean acidification from volcano CO2 dissolving 3) anoxic (oxygen-lacking) conditions from bacteria releasing phosphorus and nutrients30
13765465185What happened in the Cretaceous extinction and what caused it?took over 50% of sea life, many terrestrial plants and animals, and all of dinosaurs (except birds) causes: 1) presence of iridium in sedimentary rock from that time suggests meteorite impact 2) dust clouds from impact blocked the sun 3) the Chicxulub crater off the coast of Mexico is evidence of mass meteorite collision31
13765520580About how long does it take for diversity to recover following a mass extinction?5-10 million years32
13765525839adaptive radiationAn evolutionary pattern in which many species evolve from a single ancestral species which follows mass extinction, evolution of novel characteristics, and the colonization of new regions33
13765575475Heterchronyan evolutionary change in the rate or timing of developmental events34
13765586525What are contrasting shapes of human and chimp skulls the results of?relative growth rate35
13765600439Are chimp and human skulls more similar at birth or older age?at birth36
13765606328PaedomorphosisThe retention in an adult organism of the juvenile features of its evolutionary ancestors the rate of reproductive development accelerates compared with somatic development37
13765683598What do homeotic genes determine?where wings and legs are on the body plan38
13765793420Hox geneshomeotic genes that provide positional information during animal embryonic development (head-to-tail axis)39
13765810212What do changes in the Ubx gene result in?turns off let development40
13765837225Are changes in the regulation of development genes or changes to the sequence of genes more harmful?changes to the sequence of genes are more harmful41
13765888655What have complex eyes evolved from?photosynthetic cells (like simple limpets)42
13765927630Exaptionsstructures that evolve in one context but become co-opted for another function they do NOT evolve in anticipation of future use43

Campbell Biology Chapter 24 Flashcards

Terms : Hide Images
8782132600SpeciationThe origin of new species0
8782132601MacroevolutionBroad patterns of evolutionary change above the species level1
8782132602Biological Species ConceptA group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring2
8782132603Reproductive isolationBarriers impede two species from producing viable, fertile offspring3
8782132604HybridsOffspring of crosses between different species4
8782132605Prezygotic BarriersBefore sperm fertilizes egg5
8782132606Habitat isolationTwo species encounter each other rarely, or not at all, because they occupy different habitats, even though not isolated by physical barriers6
8782132607Temporal isolationSpecies that breed at different times of the day, different seasons, or different years cannot mix their gametes7
8782132608Behavioral isolationCourtship rituals and other behaviors unique to a species are effective barriers8
8782132609Mechanical isolationMorphological differences can prevent successful mating9
8782132610Gametic IsolationSperm of one species may not be able to fertilize eggs of another species10
8782132611Postzygotic barriersInviability of offspring created after fertilization11
8782132612Reduced hybrid viabilityFertilized eggs fail to develop12
8782132613Reduced hybrid fertilityEven if hybrids are vigorous, they may be sterile13
8782132614Hybrid breakdownSome first-generation hybrids are fertile, but when they mate with another species or with either parent species, offspring of the next generation are feeble or sterile14
8782132615Morphological Species ConceptDefines a species by structural features15
8782132616Ecological Species ConceptViews a species in terms of its ecological niche16
8782132617Phylogenetic species conceptDefines a species as the smallest group of individuals on a phylogenetic tree17
8782132618Allopatric SpeciationPhysical barrier separates a population; form of speciation18
8782132619Sympatric SpeciationNo barrier separates a population; form of speciation19
8782132620PolyploidyPossessing more than 2 sets of chromosomes; occurs most often in plants and decreases gene flow between polyploids and normal individuals20
8782132621AutopolyploidyMutations that result in doubling of chromosome numbers as a result of non-disjunction in meiosis21
8782132622AllopolyploidyMating between different species produces polyploid individuals; the hybrid has an error in meiosis which doubles chromosomes, creating 2 diploid gametes which may be viable22
8782132623Hybrid ZonePlace where the ranges of two species overlap and they mate to produce hybrids23
8782132624ReinforcementStrengthening of barriers24
8782132625FusionWeakening of barriers25
8782132626StabilityOdd stasis of statis quo; though hybrids aren't healthy, they continue to be created26
8782132627Punctuated EquilibriumPeriods of apparent stasis interrupted by sudden change; supported by fossil evidence27
8782132628GradualismSlow, steady change of organisms to new species28

Campbell Biology Chapter 24 Flashcards

Terms : Hide Images
9697726453SpeciationThe origin of new species0
9697726454MicroevolutionChanges in allele frequency in a population over time1
9697726455MacroevolutionBroad patterns of evolutionary change above the species level2
9697726456Biological Species ConceptA group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring3
9697726457Reproductive isolationBarriers impede two species from producing viable, fertile offspring4
9697726458HybridsOffspring of crosses between different species5
9697726459Prezygotic BarriersBefore sperm fertilizes egg6
9697726460Habitat isolationTwo species encounter each other rarely, or not at all, because they occupy different habitats, even though not isolated by physical barriers7
9697726461Temporal isolationSpecies that breed at different times of the day, different seasons, or different years cannot mix their gametes8
9697726462Behavioral isolationCourtship rituals and other behaviors unique to a species are effective barriers9
9697726463Mechanical isolationMorphological differences can prevent successful mating10
9697726464Gametic IsolationSperm of one species may not be able to fertilize eggs of another species11
9697726465Postzygotic barriersInviability of offspring created after fertilization12
9697726466Reduced hybrid viabilityFertilized eggs fail to develop13
9697726467Reduced hybrid fertilityEven if hybrids are vigorous, they may be sterile14
9697726468Hybrid breakdownSome first-generation hybrids are fertile, but when they mate with another species or with either parent species, offspring of the next generation are feeble or sterile15
9697726469Morphological Species ConceptDefines a species by structural features16
9697726470Ecological Species ConceptViews a species in terms of its ecological niche17
9697726471Phylogenetic species conceptDefines a species as the smallest group of individuals on a phylogenetic tree18
9697726472Allopatric SpeciationPhysical barrier separates a population; form of speciation19
9697726473Sympatric SpeciationNo barrier separates a population; form of speciation20
9697726474PolyploidyPossessing more than 2 sets of chromosomes; occurs most often in plants and decreases gene flow between polyploids and normal individuals21
9697726475AutopolyploidyMutations that result in doubling of chromosome numbers as a result of non-disjunction in meiosis22
9697726476AllopolyploidyMating between different species produces polyploid individuals; the hybrid has an error in meiosis which doubles chromosomes, creating 2 diploid gametes which may be viable23
9697726477Hybrid ZonePlace where the ranges of two species overlap and they mate to produce hybrids24
9697726478ReinforcementStrengthening of barriers25
9697726479FusionWeakening of barriers26
9697726480StabilityOdd stasis of statis quo; though hybrids aren't healthy, they continue to be created27
9697726481Punctuated EquilibriumPeriods of apparent stasis interrupted by sudden change; supported by fossil evidence28
9697726482GradualismSlow, steady change of organisms to new species29

Pages

Subscribe to CourseNotes RSS

Need Help?

We hope your visit has been a productive one. If you're having any problems, or would like to give some feedback, we'd love to hear from you.

For general help, questions, and suggestions, try our dedicated support forums.

If you need to contact the Course-Notes.Org web experience team, please use our contact form.

Need Notes?

While we strive to provide the most comprehensive notes for as many high school textbooks as possible, there are certainly going to be some that we miss. Drop us a note and let us know which textbooks you need. Be sure to include which edition of the textbook you are using! If we see enough demand, we'll do whatever we can to get those notes up on the site for you!