The Punnett square for a sex-linked trait is shown. Xr is the recessive allele. Based on the Punnett square, which statement is true?

Female offspring have a 50 percent chance of expressing the recessive trait.

Both male offspring will express the recessive trait.

Both female offspring will express the recessive trait.

There's a 50 percent chance the male offspring will express the recessive trait.

Question

Biology

Kirsten Reynolds

14 October, 12:02

The Punnett square for a sex-linked trait is shown. Xr is the recessive allele. Based on the Punnett square, which statement is true?

Female offspring have a 50 percent chance of expressing the recessive trait.

Both male offspring will express the recessive trait.

Both female offspring will express the recessive trait.

There's a 50 percent chance the male offspring will express the recessive trait.

+2

Answers (1)

Know the Answer?

Macey · Answer 1

If a woman with the trait (XrXr) mates with a normal male (XY), then all (100%) of the males will express the trait, but none (0%) of the females will express it.

However, if an unaffected carrier woman (XrX) mates with a normal male (XY) then there is a 50% chance that the male offspring will express the recessive trait (XrY).