Colour blindness is a X linked recessive disorder in which the eye fails to distinguish between red and green colours. If a colour blind woman with genotype ( $X^{C} X^{C}$ ) marries a normal visioned man (XY). Which among the following possibilities are true for their male children?

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Solution

$∙$ Colour blindness gene is X-linked (present only on the X chromosome) disorder. Inorder to get affected, an individual should have gene responsible for the defect in all the X chromosomes of their cell.
$∙$ Males have only one X chomosome, hence, defect in their single X chromosome can cause colour bindness.
$∙$ On the other hand, females have 2 X chromosomes, as a result ony defect in both the sex chomosomes can cause colour blindness in them. If only one X chromosome is affected, the female will be a carrier.

Genotype of colour blind woman: undefined

Genotype of carrier woman: undefined

Genotype of colour blind man: $X^{c} Y$

Genotype of normal visioned man: XY

The cross will be as follows:From the above cross we can deduce that all the sons will be colour blind and daughters will be carriers.

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Colour blindness is a X linked recessive disorder in which the eye fails to distinguish between red and green colours. If a colour blind woman with genotype (XCXC) marries a normal visioned man (XY). Which among the following possibilities are true for their male children?

Colour blindness is a X linked recessive disorder in which the eye fails to distinguish between red and green colours. If a colour blind woman with genotype ( $X^{C} X^{C}$ ) marries a normal visioned man (XY). Which among the following possibilities are true for their male children?