If a negro marries a white skin female,
mulatto are born. If such mulatto= intermarry, progeny will show a grandua gradation of skin colour in ratio of
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The ratio of the progeny to get grand ua gradation of skin colour is 1 : 6 : 15 : 20 : 15: 6 : 1.
● When a Negro marries a white skin female the formed babies will get alleles of both characters and are called mulatto.
● When these people intermarry all complications are exhibited in the progeny like very dark, dark, fairly dark intermediate, fairly light, light and very light respectively in the above-mentioned ratio.
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