1. Most sex-linked, recessive traits–including hemophilia and color blindness–appear more frequently in males. This phenomenon is best explained by which statement?
a. Males have an X chromosome with dominant genes.
b. Most of the genes on the X and Y chromosomes of males are recessive.
c. In males, the recessive sex-linked genes appear only on the Y chromosome.
d. In males, the Y chromosome lacks the genes needed to mask the recessive genes on the X chromosome.
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