How Populations Evolve
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10 terms
Terms | Definitions |
|---|---|
 gene pool | combined genetic information of all the members of a particular population |
| allele frequency | the number of times an allele occurs in a gene pool, compared to the total number of alleles in that pool for the same gene |
| genetic equilibrium | condition in which the frequency of alleles in a population remains the same over generations |
| 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 |
| speciation | the formation of new species as a result of evolution by natural selection |
| geographic isolation | form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water |
| reproductive isolation | the inability of members of a population to successfully interbreed with member of another population of the same or related species |
| divergent evolution | pattern of evolution in which two species become more and more dissimilar |
| convergent evolution | the process by which unrelated species become more similar as they adapt to the same kind of environment |
| adaptive radiation | process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms |
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