Question

A man with a genetic disease marries a woman who does not carry the disease. It is not possible for their sons to have the disease, but their daughters will inherit it. The disease must be

Answer 1

X linked dominant

Explanation:

In X linked dominant if the father carries the abnormal X gene,all of his daughters will have the disease because daughters always inherit their father's X chromosome and if the mother carries the abnormal X gene, half of all their children (daughters and sons) will inherit the disease tendency

• In this case man is the one who is diseased and female is normal so daughters in this case will surely inherit the disease
• When a cross is made,all the sons are normal whereas daughters are diseased