NEETZoologyPrinciples of Inheritance and Variation
Under what condition would a daughter be color blind according to the paragraph?
Options
- AIf her mother is color blind and her father is a carrier
- BIf her mother is a carrier and her father is color blind
- CIf both her parents are carriers
- DIf her mother is color blind and her father is normal
Correct answer
B. If her mother is a carrier and her father is color blind
Step-by-step solution
It is a sex-linked recessive disorder due to defect in either red or green cone of eye resulting in failure to discriminate between red and green colour. This defect is due to mutation in certain genes present in the X chromosome. It occurs in about 8 per cent of males and only about 0.4 per cent of females. This is because the genes that lead to red-green colour blindness are on the X chromosome. Males have only one X chromosome and females have two. The son of a woman who carries the gene has a 50 per cent chance