Q 22. A man whose father was colour blind marries a woman who had a colour blind mother and a normal father. What percentage of male children of this couple will be colour blind? Option A 0% Option B 50% Option C 75% Option D 25%
Q 22. A man whose father was colour blind marries a woman who had a colour blind mother and a normal father. What percentage of male children of this couple will be colour blind? Option A 0% Option B 50% Option C 75% Option D 25%

Correct option: B

Explanation: Autosomal recessive disorder present on X chromosome is known as color blindness. So, a man whose father was color blind who is normal (XY ) marries a female whose mother is color blind but father was normal, so we say that the woman is the carrier XXC.

When a carries a female marries a normal male then their son will be 50%color blind.

Parents…. Husband × Wife

Genes…. XY × XCX

Gametes…..X Y × XC, X

 

  X Y
XC XCX XCY
X XX XY