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  4. A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is :

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Q. A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is :

BVP MedicalBVP Medical 2002

Solution:

Since the father is diseased and daughter also-the disease is not sex limited of course, it is sex linked. In daughters, it is expressed even when both XX chromosomes-it is dominant.