QUESTION 9 genotypes. Which of the following explains how diploidy contributes t

Question

QUESTION 9 genotypes. Which of the following explains how diploidy contributes to maintaining or preserving genetic variation in spite of natural selection? O individuals homozygous for deleterious dominant alleles are removed from the population individuals homozygous for deleterious recessive alleles are removed from the population O inbreeding is discouraged O heterozygous individuals typically have a selective advantage over the two types of homozygotes O selection cannot act on recessive alleles in heterozygous individuals

Explanation / Answer

Option 4 is the correct answer.

Heterozygous individuals typically have a selective advantage over the two types of homozygotes. This is termed as heterozygote advantage. A classical example is the allele associated with sickle-cell anaemia which protects against malaria in heterozygotes, but causes a deadly disease in homozygotes. Diploidy thus helps to maintain the recessive alleles that may not be favored in the current environment to be preserved in the gene pool by propagation in heterozygotes.

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