Why do X-linked conditions appear more frequently in males than in females?
A) Males are more likely to inherit an extra chromosome than females.
B) A male with a nonfunctioning allele on the X chromosome does not have another allele of that gene on the Y chromosome that could cover up the nonfunctioning one.
C) The Y chromosome carries many alleles that are recessive to alleles on the X chromosome.
D) Males have no X chromosomes.
E) Females have no X chromosomes.
Answer: B
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