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| 6479740861 | Theory of Evolution | the best scientific explanation for both the unity and diversity of life; proposed by Charles Darwin |  | 0 |
| 6479740863 | evolution | change in allele frequency over time; process by which modern organisms have descended from ancient organisms (decent with modification) |  | 1 |
| 6479740864 | genetic equilibrium | situation in which allele frequencies remain constant; no evolution occuring |  | 2 |
| 6479740865 | natural selection | natures way of selecting the best a particular environment; also called survival of the fittest |  | 3 |
| 6479740866 | diversity | all of the different species on Earth |  | 4 |
| 6479740867 | variation | the differences within a single species |  | 5 |
| 6479740868 | species | group of similar organisms capable of interbreeding and producing fertile offspring |  | 6 |
| 6479740869 | speciation | formation of new species |  | 7 |
| 6479740870 | common ancestry | a group of organisms share common descent if they have a common ancestor |  | 8 |
| 6479740872 | fossil record | the geological record of organisms on earth that have been preserved in the rock in a chronological order (oldest on bottom); evidence of common ancestry |  | 9 |
| 6479740875 | homologous structures | structures that have different mature forms in different organisms but develop from the same embryonic tissues; evidence of common ancestry |  | 10 |
| 6479740876 | analogous structures | is a trait or an organ that appears similar in two unrelated organisms |  | 11 |
| 6479740877 | vestigial structure | a structure that an organism has that is no longer useful to it, but that they have this structure because a common ancestor to that organism found it useful |  | 12 |
| 6479740878 | fitness | ability of an organism to survive and reproduce in its environment |  | 13 |
| 6479740879 | adaptation | inherited characteristic that increases an organism's chance of survival |  | 14 |
| 6479740880 | mimicry | the similarity of one species to another which protects one or both |  | 15 |
| 6479740881 | camouflage | when an organism blends in with its environment for protection against predators |  | 16 |
| 6479740884 | divergent evolution (adaptive radiation) | process by which a single species or small group of species evolves into several different forms that live in different ways |  | 17 |
| 6479740885 | convergent evolution | process by which unrelated organisms independently evolve similarities when adapting to similar environments | | 18 |
| 6479740886 | coevolution | the evolution of two or more interdependent species, each adapting to changes in the other |  | 19 |
| 6479740888 | punctuated equilibrium | pattern of evolution in which long stable periods (stasis) are interrupted by brief periods of rapid change |  | 20 |
| 6479740890 | gene pool | the sum of all the genes in an interbreeding population |  | 21 |
| 6479740891 | allele frequency | number of times an allele occurs in a gene pool |  | 22 |
| 6479740893 | single-gene trait | trait controlled by a single gene (ex: widow's peak in humans) |  | 23 |
| 6479740894 | polygenic trait | trait controlled by two or more genes (ex: skin color of humans) |  | 24 |
| 6479740895 | stabilizing selection | form of natural selection that occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end |  | 25 |
| 6479740896 | directional selection | form of natural selection that occurs when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve |  | 26 |
| 6479740897 | disruptive selection | form of natural selection that occurs when individuals at both ends of a distribution curve have higher fitness than individuals near the middle |  | 27 |
| 6479740898 | reproductive isolation | the inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers or differences |  | 28 |
| 6479740899 | behavioral isolation | form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding |  | 29 |
| 6479740900 | geographic isolation | form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water |  | 30 |
| 6479740901 | temporal isolation | form of reproductive isolation that occurs when members of two species occupy similar habitats, but breed at different times |  | 31 |
| 6479740903 | gene flow | is the transfer of alleles or genes from one population to another |  | 32 |
| 6479740904 | genetic drift | change in allele frequencies of a population due to chance or random events rather than by natural selection |  | 33 |
| 6516723232 | bottleneck effect | a change in the allele frequency following a dramatic reduction in the size of a population | 34 | |
| 6516728843 | founder effect | change in allele frequencies as a result of the migration of a small subgroup of a population | 35 | |
| 6516737000 | Hardy-Weinberg Principle | states that allele frequencies in a population remain constant unless 1 or more factors cause those frequencies to change | 36 | |
| 6516746196 | sexual selection | when individuals select mates based on heritable traits | 37 |
