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

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There will be no daughter colourblind

All sons will be colourblind

All daughter will be colourblind

Half of the sons will be colourblind

answer is D.

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Detailed Solution

As females have two X chromosomes, the daughter of a colorblind father will be a carrier for the trait, genotypically a heterozygous carrier, and phenotypically normal, if the male partner is colorblind.
The female progeny will have a 1:1 ratio of Normal carriers.
While the male offspring will be colorblind normal in a 1:1 ratio. The daughter of a color-blind father marries a color-blind man. Half of the generation will be colorblind.
A color-blind person's daughter carries the illness because she carries recessive genes on one X chromosome. Half sons will be colorblind as a result.

Hence, option D is the correct answer.

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