Terms : Hide Images
| 9697726453 | Speciation | The origin of new species | 0 | |
| 9697726454 | Microevolution | Changes in allele frequency in a population over time | 1 | |
| 9697726455 | Macroevolution | Broad patterns of evolutionary change above the species level | 2 | |
| 9697726456 | Biological Species Concept | A group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring | 3 | |
| 9697726457 | Reproductive isolation | Barriers impede two species from producing viable, fertile offspring | 4 | |
| 9697726458 | Hybrids | Offspring of crosses between different species | 5 | |
| 9697726459 | Prezygotic Barriers | Before sperm fertilizes egg | 6 | |
| 9697726460 | Habitat isolation | Two species encounter each other rarely, or not at all, because they occupy different habitats, even though not isolated by physical barriers | 7 | |
| 9697726461 | Temporal isolation | Species that breed at different times of the day, different seasons, or different years cannot mix their gametes | 8 | |
| 9697726462 | Behavioral isolation | Courtship rituals and other behaviors unique to a species are effective barriers | 9 | |
| 9697726463 | Mechanical isolation | Morphological differences can prevent successful mating | 10 | |
| 9697726464 | Gametic Isolation | Sperm of one species may not be able to fertilize eggs of another species | 11 | |
| 9697726465 | Postzygotic barriers | Inviability of offspring created after fertilization | 12 | |
| 9697726466 | Reduced hybrid viability | Fertilized eggs fail to develop | 13 | |
| 9697726467 | Reduced hybrid fertility | Even if hybrids are vigorous, they may be sterile | 14 | |
| 9697726468 | Hybrid breakdown | Some 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 sterile | 15 | |
| 9697726469 | Morphological Species Concept | Defines a species by structural features | 16 | |
| 9697726470 | Ecological Species Concept | Views a species in terms of its ecological niche | 17 | |
| 9697726471 | Phylogenetic species concept | Defines a species as the smallest group of individuals on a phylogenetic tree | 18 | |
| 9697726472 | Allopatric Speciation | Physical barrier separates a population; form of speciation | 19 | |
| 9697726473 | Sympatric Speciation | No barrier separates a population; form of speciation | 20 | |
| 9697726474 | Polyploidy | Possessing more than 2 sets of chromosomes; occurs most often in plants and decreases gene flow between polyploids and normal individuals | 21 | |
| 9697726475 | Autopolyploidy | Mutations that result in doubling of chromosome numbers as a result of non-disjunction in meiosis |  | 22 |
| 9697726476 | Allopolyploidy | Mating between different species produces polyploid individuals; the hybrid has an error in meiosis which doubles chromosomes, creating 2 diploid gametes which may be viable | 23 | |
| 9697726477 | Hybrid Zone | Place where the ranges of two species overlap and they mate to produce hybrids | 24 | |
| 9697726478 | Reinforcement | Strengthening of barriers |  | 25 |
| 9697726479 | Fusion | Weakening of barriers | | 26 |
| 9697726480 | Stability | Odd stasis of statis quo; though hybrids aren't healthy, they continue to be created | | 27 |
| 9697726481 | Punctuated Equilibrium | Periods of apparent stasis interrupted by sudden change; supported by fossil evidence |  | 28 |
| 9697726482 | Gradualism | Slow, steady change of organisms to new species |  | 29 |
