Biology 11th Edition by Cecie Starr ,Ralph Taggart

Exercise 13

As you read earlier, Duchenne muscular dystrophy is a genetic disorder that arises through the expression of a recessive X-linked allele. Usually, symptoms start in childhood. Gradual, progressive loss of muscle function leads to death, usually by age twenty or so. Unlike color blindness, the disorder is nearly always restricted to males. Suggest why.