Why Are Many Human Recessive Disease Alleles Maintained in Populations

question 18

Multiple Choice

Why are many human recessive disease alleles maintained in populations despite continuing selection against them?

• A)Heterozygotes have a higher fitness than either homozygote.
• B)Mutations convert recessive alleles to dominant alleles.
• C)Even when the allele frequency is low, many gametes contain the recessive allele.
• D)Allele frequency remains constant from generation to generation.

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