(one point) A man and a woman walk into a genetic counselor\'s office. The man\'
ID: 201648 • Letter: #
Question
(one point) A man and a woman walk into a genetic counselor's office. The man's brother has recently been diagnosed with Duchenne muscular dystrophy. The woman has no history of the illness in his family. a) They are concerned about having an affected child themselves. The 2. woman is pregnant with a girl. Diagram this cross. What is the chance that the child the woman carries will have the disorder? b) If they have additional children, would a sperm or egg donor help to decrease the chance of an affected child?Explanation / Answer
Duchene muscular dystrophy is x linked disorder. It is not sure if the man is affected as he would be only if his mother would have been affected. It might have been that his mother would be a carrier and his brother received the defective allele.Since the woman has no history the child has only 50 percent chance to be a carrier at most because of defective allele from the father( can be confirmed only if the father is diagnosed)
XX * XDY = XDX( 50 PERCENT), XY(50 PERCENT)
A sperm donor would help the case since the defective allele might be possibly carried by the man in this case.
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