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Which of the following pair of feature is a good example of polygenic inheritance?

(A) Human height and skin colour

(B) ABO blood group in humans and flower colour of Mirabilis jalapa

(C) Hair pigment of mouse and tongue rolling in humans

(D) Human eye colour and sickle cell anaemia.

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(A) Human height and skin colour

Human characters such as height, skin showing gradations (continous variations) in expression. These characters are determined by two or more gene pairs and they have additive or cumulative effect. These genes are called cumulative genes or polygenes or multiple factors.

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