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Human skin colour is believed to be cont...

Human skin colour is believed to be controlled by at least three seprate genes.
(a) What do you call this type of inheritance? (b) Suppose the genes are designated as A, B and C and darkness is dominant over fairness, what shall be the genotypes of the darkest, fairest and intermediate skin colour? (c) What will be the total number of allele combinations in the gametes of a person heterozygous for all the three genes?

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