Question

If a man with an X-linked dominant disease has six sons with a ***** having a normal complement of genes, then the sons will (a) not show any symptoms of the disease (b) show strong symtpoms of the disease (c) three will show a disease symptom, while three will not (d) five will show a disease symptom, while one will not Select the correct answer from above options

Answer 1

Answer is : (a) not show any symptoms of the disease

An individual gets one sex chromosome from each parent during fertilisation.

We see from the above cross that sons get their Y-chromosome from father and X-chromosome from mother.

Therefore, if a man with an X-linked dominant disease has six sons with a ***** having a normal complement of genes, their sons will show no symptom of the disease.