Question

The genes for Tyrosinemia and Marfan syndrome are divided into 4 map units on

chromosome 15. In a couple, the male is heterozygous for these genes inherited from different

parents. The woman is the carrier of the tyrosinemia gene. Tyrosinemia is transmitted in an

autosomal recessive manner, and Marfan syndrome is transmitted in an autosomal dominant

manner. What are the chances of having a healthy child in the family?

Answer 1

25% or $\frac{1} {4}$