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Evolution
Terms associated with our Evolution Unit.
| Term | Definition |
|---|---|
| adaptation | A trait that helps an organism survive and reproduce |
| population | A group of individuals that belong to the same species and live in the same area |
| gene pool | Combined genetic information of all the members of a particular population |
| evolution | Change in a kind of organism over time; process by which modern organisms have descended from ancient organisms. |
| genetic variation | Differences among individuals in the composition of their genes or other DNA segments |
| mutation | A change in a gene or chromosome. |
| genetic recombination | The regrouping of genes in an offspring that results in a genetic makeup that is different from that of the parents. |
| genetic drift | A change in the allele frequency of a population as a result of chance events rather than natural selection. |
| natural selection | A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits. |
| migration | Form of relocation diffusion involving permanent move to a new location. |
| directional selection | Form of natural selection in which the entire curve moves; 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 curves |
| stabilizing selection | Natural selection that favors intermediate variants by acting against extreme phenotypes |
| disruptive selection | form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle |
| Hardy-Weinberg Principle | principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change |
| speciation | Formation of new species |
| homologous structures | Structures in different species that are similar because of common ancestry. |
| analogous structures | Body parts that share a common function, but not structure |
| vestigial structures | remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species. |
| comparative anatomy | The comparison of body structures and how they vary among species |
| comparative embryology | Embryos of vertebrates share many anatomical homologies. |
| phylogenetic tree | A family tree that shows the evolutionary relationships thought to exist among groups of organisms |
Created by:
kmaddix
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