Duchenne muscular dystrophy is an X-linked, recessive disorder in which muscles waste away early in life, resulting in death in the teens or twenties. A man and woman in their late thirties have five children—three boys (ages 1, 3, and 10 years) and two girls (ages 5 and 7 years). The oldest boy shows symptoms of the disease. What are the probabilities that their other children will develop the
disease?
What will be an ideal response?
The probability that the girls will develop the disease is zero. The
probability that the other two boys will develop the disease is 50%.
Anatomy & Physiology
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Anatomy & Physiology