Genetics Problem?

Question

Just a brief explanation for each answer will suffice:

Pseudohypertonic muscular dystrophy (PMD) is a disorder that causes gradual deterioration of the muscles. It is seen only in boys born to apparently normal parents and usually results in death in the early teens.

A) Is PMD caused by a dominant or recessive allele?

B) Is its inheritance s*x-linked or autosomal?

C) How do you know?

D)Explain why this disorder is seen only in boys and never in girls.

Answer 1

A- recessive has the parents are apparently normal

B- it is s*x linked as it is only seen in sons

C- the disease is only seen in boys

D- the Y chromosome would be the affected chromosome girls=XX boys=XY