Answer :
Final answer:
If there is destabilizing selection against heterozygous individuals in an infinite population and the frequency of a1 is 0.55, the frequency of a1 in the population will decrease over many generations.
Explanation:
If there is destabilizing selection against heterozygous individuals in an infinite population and the frequency of a1 is 0.55, the frequency of a1 in the population will decrease over many generations.
Destabilizing selection favors the extreme phenotypes and selects against the heterozygotes.
In this case, the heterozygous individuals (a1a2) have a lower fitness compared to the homozygous individuals (a1a1 or a2a2). As a result, the frequency of the a1 allele will decrease over time.
Imagine a population in which a1a1 individuals have the highest fitness, followed by a1a2 individuals, and a2a2 individuals have the lowest fitness.
In each generation, individuals with lower fitness are less likely to survive and reproduce, resulting in a decrease in their allele frequency.
Therefore, the frequency of the a1 allele will decline over many generations in a population experiencing destabilizing selection against heterozygotes.
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