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

B) 1/2

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.

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