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Problem: What is the genotype of a man who has freckles (dominant) and is color-blind, if his mother lacked freckles?A man with a widow’s peak, whose mother was color blind and whose father had a continuous hairline, is engaged to marry a woman whose color blind mother had a continuous hairline, and whose normal visioned father had a continuous hairline.a. what is the genotype of the young gentleman?b. What is the genotype of his fiancée?If the couple in the preceding problem marry and have a family, what are the chances of them having:a. A normal visioned child with a continuous hairline?b. A color blind child with a widow’s peak?c. A normal visioned daughter with a continuous hairline?d. A color blind son with a widow’s peak?

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Problem Details

What is the genotype of a man who has freckles (dominant) and is color-blind, if his mother lacked freckles?


A man with a widow’s peak, whose mother was color blind and whose father had a continuous hairline, is engaged to marry a woman whose color blind mother had a continuous hairline, and whose normal visioned father had a continuous hairline.

a. what is the genotype of the young gentleman?

b. What is the genotype of his fiancée?


If the couple in the preceding problem marry and have a family, what are the chances of them having:

a. A normal visioned child with a continuous hairline?

b. A color blind child with a widow’s peak?

c. A normal visioned daughter with a continuous hairline?

d. A color blind son with a widow’s peak?

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Based on our data, we think this problem is relevant for Professor Mowshowitz's class at COLUMBIA.