Recessive sex-linked traits such as color blindness appear more frequently in
males because
A. males inherit only one sex chromosome.
B. males inherit two copies of every sex-linked allele.
C. sex-linked alleles are carried only on Y chromosomes.
D. males inherit only one sex-linked allele.
Explanation: In humans, recessive sex-linked traits generally occur on the X chromosome. Since males are (XY), they will inherit only one sex-linked allele on their X chromosome.
