Question

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

Answer 1

Answer:

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.