Question

A normal woman, whose father was colour-blind is married to a normal man. The sons would be

• A. 50% colour-blind
• B. All normal
• C. All colour-blind
• D. 75 % colour-blind

Answer 1

Answer: (A)

50% colour-blind

Answer 2

Color blindness is an X-linked recessive genetic condition. In cases where a normal woman's father has color blindness, she becomes a carrier of the condition. This is because she inherits one X chromosome from each parent, and the X chromosome from her father carries the genetic mutation causing color blindness.If this woman marries a man with normal vision, there is a 50% probability that their sons will inherit color blindness. This likelihood arises from the fact that their sons will receive one X chromosome from the mother and one Y chromosome from the father. Since the mother possesses one normal X chromosome and one with the color blindness mutation, there's an equal chance (50%) that the child will inherit either the normal X chromosome (resulting in no color blindness) or the affected X chromosome (leading to color blindness).Hence, the accurate statement is '50% color blind.'