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 [CBSE PMT 1998]
A) 100%
B) 25%
C) 50%
D) 75%
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B) 25% is the answer..
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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. A5 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 event
will be albino only if it is homozygous for
albinism genes. Since parents have normal
skin, it means they are heterozygous. A5 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 event
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