WAEC - Biology (1988 - No. 45)

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?

1:1

3:1

2:1:1

1:2:1

4:1

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.

WAEC - Biology (1988 - No. 45)

Explanation

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