Answer to Question #143834 in Genetics for victory

Question

Brachydactyly is autosome dominant character in humans. A man with brachydactyly (heterozygote) got married to a healthy woman. Determine the genotypes of parents and the probability of birth of healthy children.

Answer 1

А- gene for normal body developmenta if the genotype of a woman АА:

a- brachydactyly

Aa- - A man with brachydactyly (heterozygothe) P. Aa x AA

AA, Aa -genotype of a healthy woman F1. AA AA Aa Aa

100% - healthy children

if the genotype of a woman Аa

P. Aa x Aa

F1. AA Aa Aa aa

1/4=75% - healthy children

If the father is heterozygote for the brachydactyly gene. and the mother is a dominant homozygote, the probability of having healthy children is 100%. If the mother is heterosegote, then the probability of having healthy children is 75%.