Red-green color blindness is due to an X-linked recessive allelein humans. A widow’s peak (a hairline that comes to a peak in themiddle 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 acolor-blind woman with a straight hairline.
Use the family history to make predictions about the couple’schildren.
Drag the correct label to the appropriate location in the table.Not all labels will be used.
1. If the couple has a child, what is the chance that it will bea son with a widow's peak?
2. What is the chance that any son the couple has will be colorblind with a straight hairline?
3. What is the chance that any daughter the couple has will becolorblind with a widow's peak?
4. Suppose the couple had a daughter with normal color visionand a widow's peak. What is the chance that she is heterozygous forboth genes?
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