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

Question

Quizplus · Accepted Answer

X-linked dominant traits are expressed in both males (who are hemizygous for the X chromosome) and females (who can be heterozygous for the trait). Since males have only one X chromosome, if they inherit the dominant allele, they will express the trait. Females, with two X chromosomes, will express the trait if at least one of their X chromosomes carries the dominant allele.

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