Human skin color is determined by polygenic i | vedclass

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(D) Polygenic inheritance involves the control of a trait by multiple genes,where the phenotype depends on the total number of dominant alleles presen

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$7$

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(D) Polygenic inheritance involves the control of a trait by multiple genes,where the phenotype depends on the total number of dominant alleles present.For a cross involving $n$ genes,the number of phenotypes is given by the formula $(2n + 1)$.In this case,the cross is $AaBbCc 	imes AaBbCc$,where $n = 3$ (genes $A, B,$ and $C$).Substituting the value of $n$ into the formula: $2(3) + 1 = 6 + 1 = 7$.Therefore,there are $7$ distinct phenotypic classes ranging from all recessive alleles (lightest skin) to all dominant alleles (darkest skin).

Human skin color is determined by polygenic inheritance. How many types of phenotypes will be produced by the cross $AaBbCc \times AaBbCc$?

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