A human X-linked disorder is
A) found only in males.
B) more frequently expressed in females.
C) found on the Y chromosome.
D) transmitted from father to son.
E) more frequently expressed in males.

Question

A human X-linked disorder is
A) ​found only in males.
B) ​more frequently expressed in females.
C) ​found on the Y chromosome.
D) ​transmitted from father to son.
E) ​more frequently expressed in males.

Quizplus · Accepted Answer

X-linked disorders are more frequently expressed in males because males have only one X chromosome, so a single recessive mutation on the X chromosome will result in the disorder. Females have two X chromosomes, so a mutation would have to be present on both to express the disorder.

A Human X-Linked Disorder Is