A girl of normal vision whose father was colourblind marries a man of normal vision whose father was

English

Gujarati

Hindi

4.Principles of Inheritance and Variation

medium

A girl of normal vision whose father was colourblind marries a man of normal vision whose father was also colourblind. Their sons would be (of total number of $sons$)

All colourblind

$50\%$ colourblind

All normal

$25\%$ colourblind

Solution

(b) Infact the girl with normal vision is carrier because her father is colourblind (daughter of colourblind father are either colourblind or carrier) and when she marries a normal man the possibility of their sons being colourblind is $50\%$ because the genotype of parents is $X^CX$ and $XY$,

so only half of the possible combinations of $XY$ have the $X$-linked recessive genes which exhibit the disease.

Standard 12

Biology