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Ilya
9 days ago
13

In a particular human family, John and his mother both have brachydactyly (a rare autosomal dominant allele causing short finger

s). John’s father has Huntington disease (another rare autosomal dominant allele). John’s wife is phenotypically normal and is pregnant. Two-thirds of people who inherit the Huntington (HD) allele show symptoms by age 50, and John is 50 and has no symptoms. Brachydactyly is 90% penetrant.
What are the genotypes of John's parents?
Biology
1 answer:
lana [763]9 days ago
5 0

Answer:

Brachydactyly and Huntington's are phenotypic conditions that occur when a person possesses one or two dominant alleles for those traits.

John's father has Huntington's disease but does not have brachydactyly, which means his genotype is Hh/bb.

John's mother, who is healthy and has brachydactyly, likely has a genotype of hh/BB or hh/Bb.

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