LIFESCI 7B Chapter Notes - Chapter N/A: Allele Frequency, Genotype Frequency, Genetic Drift
14 Feb 2019
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Section 21. 5 migration the movement of individuals from one population to another. gene flow the movement of alleles from one population to another through interbreeding of some of their respective members. Mutation increases genetic variation. bottleneck an extreme, usually temporary, reduction in population size that often results in marked genetic drift. The frequency of a in this new population is 1/4 because each individual has two alleles, giving a total of four alleles. In other words, the bottleneck resulted in a dramatic change in allele frequencies. The impact of genetic drift depends on population size (fig. If m arises in a very small population, its frequency will change rapidly, as shown in figs. Imagine m arising in a population of just six individuals (or three pairs). http://www. macmillanhighered. com/brainhoney/resource/6716/digital_first_content/trunk/test/morri s2e/asset/img_ch21/morris2e_ch21_fig_21_13. jpg. The fate of neutral mutations is governed by genetic drift, the effect of which is more extreme in small populations than in large populations.
