A couple having normal vision gave birth to a son having colour blindness(sex linked disease).On investigation it was discovered that the gene was inherited from the child's grandparents(mother side).Justify showing a proper cross.

Grandparents have genotype female-XhX  and male- XhY
The mother may have genotype XhX  and XhXh but she has normal vision so she will have XhX but she is a carrier therefore to their son  its infected X gene and fathers Y gene is transferred do he is colorblind.The father genotype is XY because he has normal vision

Therefore the genotype of the son will be XhY which is he is a colorblind 

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