question_answer

                Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino?

A)                                                                                                                                                                                         100%

B)              25%                          

C)              50%          

D)              75%             Since albinism is a recessive character, a child will be albino only if it is homozygous for albinism genes. Since parents have normal skin, it means they are heterozygous. As a result of cross between two heterozygous parents, 25% of the children will be homozygous recessive. The nature of the second child is not affected in any way by the nature of the first child because both are independent events.