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August 12th, 2017 
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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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