Answer:
A. The fitness of AA and Aa individuals are higher than the fitness of aa individuals.
Explanation:
Frequency of allele A will increase if the fitness of AA and As individuals are higher than the fitness of aa individuals because this condition will select individuals who carry A allele, making that this allele will be more common.
If the fitness of heterozygotes is higher than the fitness of either homozygote, both allele frequencies A and a will be favored and there won't be significant differences between them.
In option C the fitness of heterozygotes is lower than the fitness of either homozygote, so individuals aa will have a higher fitness as well as individuals AA. In this situation, both allele frequencies (A and a) will be favored too. So, the correct answer is (A).
Considering a locus with two alleles, A and a. The frequency of the A allele increase if the fitness of AA and Aa individuals are higher than the fitness of aa individuals.
A variable form of a gene is known as an allele.
Some genes exist in several distinct versions, all of which are found at the same genetic locus on a chromosome.
Alleles play a role in the phenotype of an organism, which is how it appears on the outside.
Some alleles are recessive or dominant.
Thus, the correct option is A, The fitness of AA and Aa individuals are higher than the fitness of aa individuals.
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