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pettitchristy1
22.06.2020 •
Biology
A man who has pattern baldness married a woman who is a carrier for the trait. What percent of their male children would be expected to develop male pattern baldness as adults?
A 25%
B 0%
C 50%
D 100%
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Ответ:
C. 50%
Explanation:
Baldness is sex-linked, so we need to use the X and Y chromosome notation. Let's represent baldness with B, and no baldness as b.
Man: XB Y
Woman: XB Xb
(Remember, she's a carrier: so she has one B allele, but not both, otherwise she would express the trait.)
What's next - Punnett square, our old buddy:
XB Y
XB XB XB XB Y
Xb XB Xb Xb Y
So out of that square, they've got two males. That's our denominator. And it wants to know how many male progeny will be bald: that's only one, the one with XB Y. He will express the B allele because the Y's kinda just like a placeholder. So the probability is 50%.
Ответ: