Identify the statements which are true with respect to colour blindness
A. Sex-linked recessive disorder
B. Sufferers are unable to differentiate between red or green colour
C. It occurs in 8% males and 0.4% females.
D. The defect is due to the mutation in genes present on "Y" chromosome
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A, B and C only
A. Sex-linked recessive disorder — True.
B. Sufferers are unable to differentiate between red or green colour — True.
C. It occurs in 8% males and 0.4% females. — True.
D. The defect is due to the mutation in genes present on "Y" chromosome — False. The genes are on the X chromosome.
NCERT Extract:
Mendelian Disorders – “… Myotonic dystrophy) (b) Autosomal recessive trait (for example: Sickle-cell anaemia) Colour Blidness : 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.”