Question

If a female who is a carrier for a sex-linked trait mateswith

a male who expresses the trait, what is the chace that her sonwill
express the trait?
A) 1/4
B) 1/2
C) all of her sons will express the trait
D) none of her sons will express the trait
for lifesaver, explain the reasoning for
youranswer.......

Answer 1

B) 1/2

Step-by-step explanation:

A sex linked trait is passed via sex chromosomes. Here the given trait is X linked recessive because female carrier is not possible for X linked dominant trait.

For X linked recessive trait:

Carrier female = XCXc

Affected male = XcY

Their progeny:

XC Xc

Xc XCXc XcXc

Y XCY XcY

Out of the sons, half will be not affected ( XCY ) and half will be affected ( XcY )

Hence, half of the sons will express the trait.