An allele determines the probability that genetic drift will result in the allele's fixation: The higher the allele's frequency, the more likely it is that the allele will become fixed in the population. In addition, as one allele goes to fixation, the heterozygosity of the population decreases. The rate at which heterozygosity changes with genetic drift depends on the genetic diversity and remains constant.
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Genetic drift is the random change in allele frequencies in a population over time due to chance events. It is more pronounced in smaller populations. Show more…
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In a large, sexually reproducing population with random mating with respect to phenotype, the frequency of an allele changes from 20% to 60% across several generations. Based upon this change in allele frequency, the most likely cause of the change is that the allele mutates readily, that genetic drift is responsible for the increase in the allele's frequency, that the allele codes for a trait that is maladaptive in the population, or that the allele codes for a trait that is adaptive in the population.
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List the ways in which evolution can affect population variation and describe how they influence allele frequencies.
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