June Has Two Brothers with Becker Muscular Dystrophy (BMD), an X-Linked

Multiple Choice

June has two brothers with Becker muscular dystrophy (BMD) , an X-linked recessive condition that allows affected males to survive into adulthood. Her parents are phenotypically normal. She marries Sheldon who also has BMD. June and Sheldon have a daughter. What is the probability that this daughter will have BMD?

A) near 0
B) 1/4
C) 1/2
D) 3/4
E) 1/8