Read the given passage and answer the following questions :

Colour Blidness is a sex-linked 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.

Diseased father to pass gene to his son.

The correct answer is Option (4) -Diseased father to pass gene to his son.

Color blindness is a sex-linked recessive disorder that is located on the X chromosome. Here's why the given statement is impossible:

• Males have one X and one Y chromosome (XY), and females have two X chromosomes (XX).
• A diseased father (who has color blindness) carries the affected gene on his X chromosome.
• Sons inherit their Y chromosome from their father and their X chromosome from their mother. Therefore, a father cannot pass an X-linked gene (such as color blindness) to his son, because the son receives the Y chromosome from the father.

On the other hand:

• A carrier mother can pass the gene to both her son and daughter.
• A diseased father can pass the gene to his daughter, as she inherits one X chromosome from him.