Question

Question: Some heritable recessive genetic conditions can persist in some populations even though the genetic condition presents health complications. Which of the following is not a correct reason for why these recessive alleles persist in populations?

A.) Individuals who are heterozygous for the recessive allele will have no symptoms and therefore no negative selection against heterozygous carriers

B.) certain environmental conditions can create positive selection for individuals who are heterozygous for the recessive allele

C.) Individuals who are homozygous for the recessive allele have a higher reproductive fitness

D.) all answers are correct reasons

Answer 1

C.) Individuals who are homozygous for the recessive allele have a higher reproductive fitness

The heterozygous genetic condition has greater reproductive fitness than the homozygous recessive or homozygous dominant genotype. It occurs due to the overdominance of the one of the allele in heterozygous genetic condition.On the other hand,the recessive phenotype doesn't prevails the symptoms of the diseases if they are few in number. The enivironmental condition causes the mutation in the DNA at some place and any person can carry those muation in the recessive gene.