A man with blood group A (TAP) married a woman with blood group O (pp)....

WAEC 1988

A man with blood group A (TAP) married a woman with blood group O (pp). Which of the following is the
probable ratio of the blood groups of the offspring?

A. 1:1
B. 3:1
C. 2:1:1
D. 1:2:1
E. 4:1

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Correct Answer: Option A

Explanation

Since the man has blood group A ( AO or AA genotype), and the woman has blood group O (OO genotype), the posssible phenotypes and and genotypes of their offsprings are:

AO (A) : 50%

OO (O) : 50%

So the probable ratio of their blood groups of the offspring is: 1 : 1

You can view the crossing in the diagram above.

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