Solution-Controlled by a recessive gene

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Solution-Controlled by a recessive gene

Albinism in human is controlled by a recessive gene ‘a’. If both parents were known to carrier (Aa) for albinism. What is the chances of 1 normal and 3 albino in family of four and how?

(1) 12/256

(2) 81/256

(3) 108/256

(4) 54/256

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