Question

A colourblind man has a colourblind sister but a normal brother then what will be the phenotype of parents?

• A. Father colourblind and mother normal
• B. Father normal and mother colourblind
• C. Father and mother both are colourblind
• D. Father and mother both are normal

Answer 1

The correct option is A Father colourblind and mother normal

Colourblind sister - Xc Xc
Normal brother - XC Y.
Thus, phenotype of father - Colourblind - Xc Y
Phenotype of mother - normal - XC Xc (Carrier)