Question

A colour blind man marry with a daughter of colour blind father, the generation will be

• A. all children will be colorblind
• B. only sons will be colourblind
• C. only daughters will be colourblind
• D. half sons will be colourblind

Answer 1

The correct option is D half sons will be colourblind

Daughter of a color blind father will be carrier for the trait, as female has two X chromosomes, genotypically she will be heterozygous carrier and will be phenotypically normal. If married to a color blind male. The female progenies will be Normal:carrier in a ratio of 1:1. While, the male progenies will be in a ratio colorblind:normal in a ratio of 1:1

So, the correct answer is 'half sons will be colourblind'