In man, the blue eye colour is recessive to the brown eye colour. If the boy has brown eye and his mother is blue eyed, what would be the phenotype of his father?

Black eye

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Brown eye

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Green eye

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Blue eye

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Solution

The correct option is A Brown eye
In man, blue eyes are recessive and brown ones are dominant.
In case of human males - XY (Only X chromosome can carry genes, but Y cannot)
In case of human females - XX (Both X chromosomes will carry genes)
If the son is having Brown eyes, his expected genotype is XB Y
Genotype of mother with blue eyes is XbXb
Thus the genotype of father has to contain one B gene which had transferred to the offspring.
Genotype of father is XB Y- Phenotype is brown eyes

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