Q.

If a black man marries a white skin female, the mulattoes are born. If such mulattoes intermarry, the progeny will show a gradual gradation of skin colour in the ratio of

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a

9 : 3 : 3 : 1

b

1 : 4 : 6 : 4 : 1

c

1 : 4 : 6 : 15 : 20 : 15 : 6 : 4 : 1

d

1 : 6 : 15 : 20 : 15 : 6 : 1

answer is D.

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Detailed Solution

Mullatoes have genotype as AaBbCc and if they intermarry, the phenotypic ratio of offspring with skin tone is 1 : 6 : 15 : 20 : 15 : 6 : 1.

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