Males are more often affected by sex-linked traits than females ...

[Hungry!]

Males are more often affected by sex-linked traits than females because
A) male hormones such as testosterone often alter the effects of mutations on the X chromosome.
B) female hormones such as estrogen often compensate for the effects of mutations on the X chromosome.
C) X chromosomes in males generally have more mutations than X chromosomes in females.
D) males are hemizygous for the X chromosome.
E) mutations on the Y chromosome often worsen the effects of X-linked mutations.

[camila]

100% it's D, don't forget to gimmi a thumbs up

[Hungry!]

Thanks so much, you were right on.