13 Jun Red-green color blindness is due to an X-linked recessive allele in humans
Question
Red-green color blindness is due to an X-linked recessive allele in humans. A widow’s peak (a hairline that comes to a peak in the middle of the forehead) is due to an autosomal dominant allele.
Consider the following family history:
A man with a widow’s peak and normal color vision marries a color-blind woman with a straight hairline.
The man’s father had a straight hairline, as did both of the woman’s parents. Use the family history to make predictions about the couple’s children.
What is the chance that any son that the couple has will be color blind with a widow’s peak?
If the couple has a child, what is the chance that it will be a daughter with a widow’s peak?
Suppose the couple had a daughter with normal color vision and a widow’s peak. What is the chance that she is homozygous for both genes?
What is the chance that any daughter the couple has will be color blind with a straight hairline?
Choices: 1/4, 3/4, 0, 1, 1/2
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