Males express both the dominant and recessive alleles on their X chromosome because they have only one copy of the X chromosome. This means any trait coded for by a gene on the X chromosome will be expressed, regardless of whether it is dominant or recessive, because there is no corresponding allele on a second X chromosome to potentially mask its expression.

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A Male Expresses

Question 50

Multiple Choice

A male expresses

A) only the dominant alleles on his X chromosome.
B) none of the alleles on his X chromosome.
C) only the homozygous recessive alleles on his X chromosome.
D) None of the answer choices are correct.
E) both the dominant and recessive alleles on his X chromosome.

Correct Answer: