evolution/extinction
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15 terms
Terms | Definitions |
|---|---|
 Natural Selection | mechanism for evolution. nature helps select the strongest to survive. |
| Population | Members of one species living, competing, and interbreeding together. |
| Genetic Drift | Random change/flucation in the frequency/number of alleles caused by factors of fitness. Happens in all populations. |
| Directional Selection | where individuals at one end of a distribution curve have a higher fitness than those at the other end. |
| Stabilizing Selection | where individuals in the middle of a distribution curve have a higher fitness than those at the ends. |
| Disruptive Selection | Natural selection type where individuals at both ends of a distribution curve have a higher fitness than those in the middle. |
| Relative Frequency | How many of one type of allele is present in a gene pool compared to other alleles. |
| Polygenic trait | an inheritable trait that has a bell shaped distribution curve for a population.an inheritable trait that is controled by two or more genes |
| Acquired traits | traits gained or lost over time. not inherited. not a mechnism for evolution. |
| microevolution | a change in the proportion of alleles in a population.occur due to genetic drift or natural selection. |
| adaption | a trait that enhances fitness from natural selection |
| macroevolution | large-scale evolutionary changes that take place over long periods of time |
| fitness | ability of an organism to survive and reproduce in its environment |
| extinction | no longer in existence |
| founder effect | Genetic drift that occurs when a few individuals become isolated from a larger population, with the result that the new population's gene pool is not reflective of the original population. |
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