. In human males, even some recessive sex-linked alleles are able to express their effect because

A.         there is a single genome.

B.         autosomes are single but sex chromosomes are two.

C.         there is only one x-chromosome.

D.         there is only one Y-chromosome.

Best Answer

C.    Males express more recessive sex-linked traits than females because they have only one X-chromosome. The Y-chromosome contains less genes than the X-chromosome, thus males do not have a second allele for traits carried on either chromosome.

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