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Blue eyes are recessive to brown. A brown eyed man marries a blue-eyed woman. What are...

Blue eyes are recessive to brown. A brown eyed man marries a blue-eyed woman. What are the possible phenotypes and genotypes of their potential children? How many could have blue eyes?

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Answer #1

Trait: Eye colour

Brown-eyed man has the following genotype: BB( homozygous dominant) and the gametes are- B, B

Blue-eyed woman has the following genotype: bb(homozygous recessive) and the gametes are- b,b

A cross between the two persons will yield the following result shown with the help of Punnett square.

b b
B Bb Bb
B Bb Bb

From the Punnett square, we can see that all offsprings( heterogeneous dominant) exhibit brown eye colour as the dominant gene B is present in all cases.

Hence, the phenotypic ratio- all alike

And, as the genes present in each individual is the same, thus the genotypic ratio will be all alike.

None of the offsprings will exhibit blue coloured eyes.  

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