| A | B |
|---|
| embryos | Organisms at early stages of development |
| homologous structures | part of organism that developed from same basic part but meets different needs |
| vestigal organs | may resemble miniature legs, tails, or others |
| appendix | Digestive vestigal organ present in humans |
| common ancestor | Darwins conclusion: descent from a ___________ |
| artificial selection | intervention from humans that ensures that only desirable offspring are produced |
| natural selection | natural process in which those most suited to produce offspring will survive |
| survival of the fittest | individuals whose characteristics are best fitted to enviroment will survive |
| populations | collection of individuals of the same species |
| gene pool | the common group of genes that a population share |
| relative frequency | number of times a allele occers compared to other alleles of same gene |
| species | group of similiar-looking organisms that breed and produce offspring |
| niche | organisms "job" and place it lives |
| reproductive isolation | seperation of populations so they cant interbreed |
| adaptive radiation | process in which one species gives rise to many species |
| divergent evolution | also known as adaptive radiation |
| convergent evlution | Different organisms produce into species similiar in appearence and function |
| analogous structures | body parts that are similiar in appearence and function but from different origins |
| genetic drift | random change in frequency of a gene |
| gradualism | theory that that evolution occurs slowly and gradually |
| equilibrium | a state of little change |
| mass extinction | complete removal of a species |
| punctuated equilibria | pattern of long stability interrupted by brief periods of change |
