Chapter 9, Problem 8SQ

Summary Introduction

To explain:

The chances of the occurrence of the Duchenne muscular dystrophy, which is a sex-linked recessive disorder in the second progeny of a couple named Carla and Rudy, if their first son has this disease.

Introduction:

The disease Duchenne muscular dystrophy is a sex-linked recessive disease, which is caused due to a cross between a male and a female named Carla and Rudy, which are carriers for the disease. It causes the weakness of the muscles of the human body. The first son of the couple is affected and the chance of the occurrence of the disease is $25\%$(percentage) in the second child as both the parents are carriers of the disease. The effect is only on one of the chromosome in both the parents, where mutation takes place in a single allele of a gene.