A human X-linked recessive gene may be
A)found on the Y chromosome.
B)passed to daughters from their fathers.
C)passed to sons from their mothers.
D)expressed more commonly among females.
E)passed to daughters from their fathers and passed to sons from their mothers.

Question

Quizplus · Accepted Answer

An X-linked recessive gene is located on the X chromosome. Females have two X chromosomes, while males have one X chromosome and one Y chromosome. Therefore, a recessive gene on the X chromosome will be expressed more commonly in males than in females. Females can be carriers of an X-linked recessive gene, but they will not express the trait unless they inherit two copies of the gene (one from each parent). Males, on the other hand, will express the trait if they inherit even one copy of the gene.

A Human X-Linked Recessive Gene May Be