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AP Biology Chapter 9 Key Terms Flashcards

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225625886Hereditythe transmission of traits from one generation to the next
225625887Geneticsthe scientific study of heredity
225625888Charactera heritable feature that varies among individuals, such as flower color
225625889Traiteach varient for a character, such as purple or white flowers, brown or blond hair
225625890Self-fertilizesperm-carrying pollen grains released from the stamens land on the egg-containing carpel of the same flower
225625891Cross-fertilizationfertilization of one plant from the pollen of another plant
225625892True-breeding varietiesvarieties for which self-fertilization produced offspring all identical to the parent
225625893Hybridthe offspring of two different varieties
225625894Genetic crosscross fertilization is simply referred to as this
225625895P generationthe true-breeding parental plants
225625896F1 generationthe parental plants hybrid offspring
225625897F2 generationthe self or cross fertilized offspring of the F1 generation
225625898Dihybrid crossa mating of parental varieties differing in two characters
225625899Law of Independent Assortmentthe inheritance of one character has no effect on the inheritance of another
225625900Testcrossa mating between and individual of unknown genotype (a BB or Bb black lab, you dont know) and a homozygous recessive (bb, chocolate lab) individual.
227682766Monohybrid Crossa cross in which the parents differ in only one characteristic
227682767Allelethe alternative version of a gene
227682768Homozygousan organism that has two identical alleles for a gene is said to be this
227682769Heterozygousan organism that has two different alleles for a gene is said to be this
227682770dominant allelethe allele that if present will always show, PP or Pp
227682771recessive allelethe allele that will only show if two of the same, pp
227682772law of segregationa sperm or egg carries only one allele for each inherited character because allele pairs separate from each other during the production of gametes
227682773Punnett Squarea chart that shows all the possible combinations of alleles that can result from a genetic cross
227682774Phenotypean organisms physical trates (purple or white flowers)
227682775Genotypean organisms genetic makeup (PP,Pp,pp)
227682776Locusa specific location of a gene along the chromosome
227682777Rule of multiplicationthe probability of such a compound event is the product of the probabilities of each independent event
227682778Rule of additionthe probability that an event can occur in two or more alternative ways is the sum of the separate probabilities of the different ways
227682779Wild-type traitstraits prevailing in nature
227682780Pedigreea family tree that contains all the information of who in the family had or didnt have a specific trait
227682781Carriersomeone who has a recessive allele but also has a dominant one
227682782Cystic Fibrosis (CF)the most common life threatening genetic disease in the US, caused by a recessive allele, excess mucus in the lungs, increased susceptibility to infections, death in early childhood if not treated
227682783Inbreedingmatings between close blood relatives
227682784Achondroplasiaa form of dwarfism in which the head and torso of the body develop normally but the arms and legs are short
227682785Huntington's Diseasea degenerative disorder of the nervous system that usually does not appear until middle age, fatal
227682786Amniocentesisthe collections of fetal cells, from the amniotic fluid that bathes the fetus, for genetic testing
227682787Chorionic villus sampling (CVS)a physician extracts a tiny sample of chorionic villus tissue from the placenta, the organ that carries nourishment and wastes between the fetus and the mother, and uses them to make a karyotype
227682788Ultrasound imaginguses sound waves to produce a picture of the fetus directly
228597719Complete Dominancethe dominant allele has the same phenotypic effect whether present in one or two copies
228597720Incomplete Dominancethe appearance of the F1 hybrids falls between the phenotypes of the two parents varieties
228597721ABO Blood Groupgenetically determined classes of human blood that are based on the presence or absence of carbohydrates A and B on the surface of red blood cells; the phenotypes, also called blood types, are A, B, AB, and O
228597722Codominantthe expression of both alleles in a heterozygous individual
228597723PleiotropyA single gene having multiple effects on an individuals phenotype
228597724Sickle-cell diseasemakes red blood cells produce abnormal hemoglobin proteins
228597725Polygenic inheritancethe additive effects of two or more genes on a single phenotypic character, the converse of pleiotropy
228597726The Chromosome Theory of Inheritancegenes occupy specific loci on chromosomes, and it is the chromosomes that undergo segregation and independent assortment during meiosis. Thus, it is the behavior of chromosomes during meiosis and fertilization that accounts for inheritance patterns
228597727Linked Genesgenes located close together on the same chromosome
228597728Recombinant Frequencythe percentage of recombinants
228828169Linkage Mapa diagram of relative gene location
228828170Sex chromosomesthe pair of chromosomes, designated x and y, that determine and individuals sex
228828171Sex-linked genea gene located on either sex chromosome
228828172Hemophiliaan x-linked recessive trait with a long, well-documented history. Hemophiliacs bleed excessivley when injured because they lack one of more of the proteins required for blood clotting.
228828173Red-green colorblindnessa sex-linked recessive disorder in humans that causes a malfunction of light-sensitive cells in the eyes
228828174Duchenne muscular dystrophya condition characterized by a progressive weakening of the muscles and a loss of coordination, is another human x-linked recessive disorder

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