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(A) : Polygenic (or Quantitative) inheritance is a type of inheritance in which the expression of a trait is controlled by two or more genes. In this,

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Skin colour in humans

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(A) : Polygenic (or Quantitative) inheritance is a type of inheritance in which the expression of a trait is controlled by two or more genes. In this,each dominant allele contributes only a unit fraction of the trait,and the total phenotypic expression is the sum total of the additive or cumulative effect of all dominant alleles of the genes/polygenes.Human skin colour is a classic example of polygenic inheritance,which is controlled by three pairs of polygenes,$A, B$,and $C$.Negro (dark) skin colour is due to the presence of all six dominant contributing alleles $(AABBCC)$.Very light (white) skin colour is due to the presence of all six recessive non-contributing alleles $(aabbcc)$.

Which one of the following is an example of polygenic inheritance?

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