2.2: Agents of Evolutionary Change - Genetic Drift

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6 Terms

1
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genetic drift

random sampling of alleles across generations - more influential in small populations

2
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population

group of individuals that share genetic information. In sexual organisms, group of individuals that have potential to exchange genetic information over small number of generations

3
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gene pool

sum of genetic information (genetic composition) that is carried in population

4
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what can change gene pools

new variations added by mutation or random sampling across generations due to processes including:

  • random assignment of alleles from parent to offspring

  • randomly paired breeding partners may produce more offspring than others

  • some individuals have multiple partners

5
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what is genetic drift’s influence on variation

only removes variation - never adds

6
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influence of drift on different pop sizes

small pop = very influential. Large pop = weak force