The daughter of a colour- blind father and a normal mother marries a normal male. What percentage of male children of this couple will be colour -blind ?

Step-by-step solution

Colour blindness is an X-linked recessive disorder. Genotype of the colour-blind father: X^c Y Genotype of the normal mother: X^C X^C The daughter receives the X^c chromosome from her father and the X^C chromosome from her mother. Thus, her genotype is X^C X^c (carrier). She marries a normal male, whose genotype is X^C Y . The cross between the carrier female ( X^C X^c ) and the normal male ( X^C Y ) produces the following offspring: Male children receive their X chromosome from the mother and Y chromosome from the