Term
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Definition
| When some alleles become more common in a population, and other less common, from one generation to the next. |
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Term
| What does evolution provide? |
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Definition
a means of understanding nature in all its complexity.
-familiar things
-new, natural phenomena |
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Term
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Definition
| Individuals in a species are identical and unchanging (350 B.C.E) |
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Term
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Definition
| Species change as they spread from their original location (1749) |
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Term
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Definition
| Changes in nature are gradual. Uniformitarianism (1785) |
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Term
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Definition
| Species reappear after catastrophes; fossils represent extinctions |
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Term
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Definition
| Individuals do not evolve. POPULATIONS evolve. |
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Term
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Definition
| all the members of a single species occupying a particular area at the same time and reproducing with one another |
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Term
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Definition
| small measurable evolutionary change within a population from generation to generation |
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Term
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Definition
1.Mutation
2.Gene flow
3.Nonrandom mating
4.Genetic drift
5.Natural selection |
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Term
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Definition
| production of new alleles |
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Term
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Definition
movement of alleles from
population to population |
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Term
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Definition
| selection of mate according to phenotype |
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Term
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Definition
| changes in allele frequencies due to random chance (e.g. catastrophe) |
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Term
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Definition
| death and/or low reproduction from organisms with “unfit” a |
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Term
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Definition
| an organism’s realized ability to reproduce relative to other individuals |
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Term
| components of natural selection |
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Definition
1.Variation
2.Inheritance
3. Varying degrees of reproductive success |
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Term
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Definition
| The collection of alleles that for each gene. (I.e different colors of the same shirt) |
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Term
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Definition
| one extreme phenotype is fittest, phenotype moves toward that extreme over time |
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Term
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Definition
| extreme phenotypes are less fit than the optimal intermediate phenotype – most common in stable, unchanging environments |
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Term
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Definition
| 2 or more extreme phenotypes are fitter than the intermediate phenotype |
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Term
| The goal of natural selection |
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Definition
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Term
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Definition
| Selection with a goal in mind |
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Term
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Definition
-Ultimate source for
allele differences
-Mutations are random |
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Term
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Definition
| Species suffers a near extinction and only a few survivors go on to produce the next generation. |
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Term
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Definition
Founders of a new population are small in
number.
Alleles dictated by chance
New population growth will only carry those random alleles. |
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Term
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Definition
seemingly harmful alleles persist in a population
This allele is probably protecting against a weakness in the homozygous genes |
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