If a trait is X- linked recessive, who would express the trait?
A) females homozygous for the recessive allele and males hemizygous for the recessive allele
B) females homozygous for the dominant allele and males hemizygous for the recessive allele
C) the same proportions of females and males
D) females homozygous for the recessive allele and males hemizygous for the dominant allele
E) heterozygous females and males hemizygous for the dominant allele

Question

Quizplus · Accepted Answer

X-linked recessive traits are expressed in females only if they have two copies of the recessive allele (homozygous) because females have two X chromosomes. Males express the trait if they have the recessive allele on their single X chromosome (hemizygous) because males have one X and one Y chromosome.

If a Trait Is X- Linked Recessive, Who Would Express