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# Pattern baldness is a sex-linked recessive trait. If a woman whose father is bald and a manwho is bald has a son and the woman’s mother does not carry the allele for pattern baldness. TheThe probability that the son will inherit the allele for pattern baldness is(A) $0\%$(B) $25\%$(C) $50\%$(D) $75\%$(E) $100\%$

Last updated date: 11th Jun 2024
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Hint: Pattern baldness is a sex-linked recessive trait. X-linked inheritance means that the gene which is causing the disorder or the trait is found on the X chromosome. The males just have one X and one Y chromosome and the Females have two X chromosomes.

A female will always inherit only one X chromosome from her father. Because the woman’s mother only carries one copy of the allele and doesn’t carry the allele for pattern baldness. If the couple has a son, there’s a $50\%$ chance that the son will inherit the X-linked allele for pattern baldness from his mother.
So the correct answer is ‘$50\%$’.