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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Anup Padwal
50% because it is inherited in an X-linked recessive pattern. Here friends father is diseased (xY)and friend is normal (xX) while her husband is nornal(XY). when xX cross with XY. Son will be xY or XY. so possibility of diseased son will be 50%.