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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?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

The daughter must be heterozygous for both genes because achondroplastic dwarfism is autosomal dominant, meaning she inherited one dwarf allele from her father and one normal height allele from her mother. For color vision, since she is not color-blind, she must have inherited her normal vision X chromosome from her mother (who must be a carrier of the color-blindness gene, as she is color-blind) and her Y chromosome from her father (making her female and not inheriting color-blindness). Therefore, she is heterozygous for both traits.

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