Fundamentholfundamenthol
NEET2022Biology
Q.

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour

  1. A

    25%

  2. B

    50%

  3. C

    75%

  4. D

    100%

Solution

Colour blindness is an X-linked recessive trait. The colour blind female has the genotype XX.

A male whose mother was colour blind must have inherited her X chromosome, which carries the colour blindness allele. So this male is XY, that is, he himself is also colour blind.

Cross: XX XY. Daughters: XX (colour blind). Sons: XY (colour blind). All offspring (100%) are colour blind.

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