Which is incorrect about colour blindness?

Options

A. This is due to defect in either red or green cone of eye resulting in failure to discriminate between red and green colour.
B. A daughter will not normally be colour blind, unless her mother is a carrier and her father is colour blind.
C. If female has `X^(c )X` then it is called carrier but when male has then `X^(c ) Y` then it will be colour blind.
D. The son of a woman who carries the gene has 25 per cent chance of being colour blind.

Answer

D

Explanation

The son of a woman who carries the gene has 50 per cent chance of being colour blind.