Marriages between close relatives should be a | vedclass

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(A) Marriages between close relatives (inbreeding) increase the probability that offspring will inherit two copies of a harmful recessive allele from

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Recessive alleles brought together

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(A) Marriages between close relatives (inbreeding) increase the probability that offspring will inherit two copies of a harmful recessive allele from a common ancestor. Since close relatives share a significant portion of their genetic material, the likelihood of both parents being carriers for the same rare recessive genetic disorder is much higher than in the general population. When both parents are carriers, there is a $25\%$ chance for each child to express the recessive trait (homozygous recessive condition). Therefore, inbreeding increases the expression of deleterious recessive traits in the population.

Marriages between close relatives should be avoided because they have a higher incidence of:

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