First slide

Inheritance of One Gene

Question

A man with type A blood married a woman, who has type AB blood. We do not know either the man is homozygous or heterzygous for the 'I' alleIe. Which one of the following types in the progeny of this couple would indicate that the man is heterozygous?

Easy

A

O
B

A
C

B
D

AB

Solution

The blood group which indicates that the man is heterozygous for the 'I' allele is blood group B.
Man - I^Ai - blood group A
Woman - I^AI^B - blood group - AB
Children - (i) - I^AI^A - blood group - A homozygous
(ii) - I^AI^B - blood group -AB
(iii) - I^Ai - blood group - A- heterozygous
(iv) - I^Bi - blood group - B - heterozygous

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