Males more commonly are affected by X-linked recessive genetic disorders than are females because
A) females have two X chromosomes and thus less of a chance to be recessive.
B) males have only one X and thus more of a chance to be recessive.
C) males have only one X, they have multiple alleles for each gene.
D) Y chromosomes cause X gene mutations.
E) males are weaker genetically than females.

Question

Quizplus · Accepted Answer

Because males have only one X chromosome, they have a higher chance of inheriting and expressing any recessive genes located on it. Females have two X chromosomes, so they have a backup copy in case one X chromosome has a recessive mutation.

Males More Commonly Are Affected by X-Linked Recessive Genetic Disorders