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What causes an allele frequency to go up in one generation and back down in the next generation?
Wiki User
∙ 13y ago
There are three basic reasons:
1. Natural Selection-- thr environment may have favored the allele in previous generations, but now disfavors it.
2. Genetic Drift-- in every finite population, the frequency of an allele will fluctuate due to chance. For example, the vast majority of sperm fail to fertlize any egg, so allels can be lost this way due to chance. Individuals carrying a copy or copies of an allele may die young due to random accidents, or may never find a mate. These basic chance events cause the frequencies of alleles to fluctuate, and the degree of frequency change depends upon the population size. The greater the population size, the smaller the change in frequency.
3. A combination of both.
Wiki User
∙ 13y ago
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