Male-pattern baldness is a X-linked recessive trait, labelled X^{\text{b}}

b

start superscript, start text, b, end text, end superscript, with the dominant normal hair gene being X^{\text{B}}

B

start superscript, start text, B, end text, end superscript.

A father with the genotype X^{\text{B}}

B

start superscript, start text, B, end text, end superscriptY and a mother with the genotype X^{\text{b}}

b

start superscript, start text, b, end text, end superscriptX^{\text{b}}

b

start superscript, start text, b, end text, end superscript have a son.

What is the percent chance that the son will inherit male-pattern baldness?

100%

Explanation:

Pattern baldness if X linked and recessive.

A father with and a mother with have a son.

First, let us look at the result of the cross between the two:

  x  

male progeny:

female progeny:

The two sons resulting from the cross inherited male pattern baldness. Hence, the percentage chance that the son will inherit male pattern baldness is 100.

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