Which of the following describes a situation, in which the predominant genotype in a population in Hardy-Weinberg equilibrium is the heterozygote? Assume that the gene of interest has only two alleles: G and g.Multiple choice question.The allele frequencies of both G and g are intermediate in value.The allele frequency of g is low.The allele frequencies of G and g are very low.Incorrect. The allele frequencies of G and g are very high.
Question
Which of the following describes a situation, in which the predominant genotype in a population in Hardy-Weinberg equilibrium is the heterozygote? Assume that the gene of interest has only two alleles: G and g.Multiple choice question.The allele frequencies of both G and g are intermediate in value.The allele frequency of g is low.The allele frequencies of G and g are very low.Incorrect. The allele frequencies of G and g are very high.
Solution
The correct answer is "The allele frequencies of both G and g are intermediate in value."
Here's why:
The Hardy-Weinberg equilibrium is a principle stating that both allele and genotype frequencies in a population remain constant from generation to generation unless specific disturbing influences are introduced. If the predominant genotype in a population in Hardy-Weinberg equilibrium is the heterozygote (Gg), this means that both alleles (G and g) are being passed on to offspring at a similar rate.
This would occur when the allele frequencies of both G and g are intermediate in value. If one allele had a very high frequency and the other had a very low frequency, then the homozygous genotype would be more common. If both allele frequencies were very low or very high, this would also not result in a predominantly heterozygous population. Therefore, the only option that fits is that the allele frequencies of both G and g are intermediate in value.
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