Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females because
A) females have two dominant genes for the disorder.
B) males have only one X chromosome.
C) males have a double dose of the gene.
D) Y chromosomes are not as strong as X chromosomes.
E) none of these.

Question

Quizplus · Accepted Answer

Males have only one X chromosome, while females have two X chromosomes. Therefore, if a male inherits a recessive gene on the X chromosome, he will express the trait because he does not have a second X chromosome with a dominant gene as females do. Females can be carriers of the disorder because they have two X chromosomes, and the dominant gene on one of their X chromosomes masks the recessive gene on the other X chromosome.

Males Tend to Be Affected in Greater Numbers by X-Linked