AP BIOLOGY

Detailed explanation-1: -Pattern baldness is a sex-linked recessive trait, which indicates that it is carried on the X chromosome. A female inherits one X chromosome from her father. Because the woman’s mother does not carry the allele for pattern baldness, the woman only carries one copy of the allele.

Detailed explanation-2: -If the couple has a son, there is a 50% chance that the son will inherit the X-linked allele for pattern baldness from his mother. The father’s baldness is irrelevant; he will pass his unaffected Y chromosome to the son. Was this answer helpful?

Detailed explanation-3: -A male who has an X-linked recessive condition will always pass on the changed gene to his daughter, who will then be a carrier. However, if he has an X-linked dominant condition his daughter will be affected.

Detailed explanation-4: -For the male offspring, there is a 50% probability that a male offspring will be homozygous recessive for the baldness gene and thus, be bald.