A phenotypically normal woman marries a man with Wilson disease,a autosomal recessive disorder.They have a son who has Wilson disease.If you need two copies of the recessive allele to be affected and the mother doesn't have the disease,how did the son get it?

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Quizplus · Accepted Answer

The son inherited one recessive allele from the father with Wilson disease and one recessive allele from the mother who is a carrier of the disease-causing allele but not affected by the disease. This results in the son having two copies of the recessive allele and hence showing the symptoms of Wilson disease.

A Phenotypically Normal Woman Marries a Man with Wilson Disease,a