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.
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let small x be color blindness and capital P be widows peak
now man has widows peak. his father was normal. so obviously mother has widows peak. so the man is heterozygous. so genotype of man is PpXY capital X becaude he has normal vision.
Women's genotype is ppxx according to the given phenotype.
PpXY X ppxx
gametes- PX PY pX pY px
so possible genotype of children- PpXx ( widow peak, normal girl)
PpxY (widow peak,color blind boy)
ppxY (normal,colorblind boy))