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

Question

Quizplus · Accepted Answer

X-linked dominant traits are expressed when an individual has at least one dominant allele on their X chromosome. Females have two X chromosomes, so they can be homozygous dominant (DD), heterozygous dominant (Dd), or homozygous recessive (dd) for X-linked dominant traits. Males have only one X chromosome, so they can only be hemizygous for X-linked traits. A dominant allele on their X chromosome would result in the expression of the trait. Therefore, heterozygous dominant females (Dd) and hemizygous dominant males (D) would both express the trait.

If a Trait Is X-Linked Dominant,who Would Express the Trait