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A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal...

A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. They have a daughter who is a dwarf with normal color vision. What is the probability that she is heterozygous for both genes?

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They have a daughter who is a dwarf with normal color vision. What is the probability that she is heterozygous for both genes?

The probability that she is heterozygous for both genes is 1.00.

The chance of her being heterozygous for both genes is 100%. As, we know that the mother is giving her daughter, as she is homozygous, she is giving db. We know that the daughter is D? B?, because of her phenotype / description, if she didn't have those dominant genes, she couldn't be a normal-sighted dwarf. We know what the mother is contributing, and know about the daughter, the daughter must be DdBb--heterozygous for both genes. Her father gave her both the normal vision and dwarfism.

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