One reason societies prohibit marriage between close blood relatives is so children are less likely to be homozygous for harmful recessive alleles

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Marriage between close blood relatives increases the probability that both parents carry the same harmful recessive alleles, which can result in their children being homozygous for these alleles, leading to genetic disorders or health issues. Societies prohibit such marriages to reduce the risk of these genetic problems.

One Reason Societies Prohibit Marriage Between Close Blood Relatives Is