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?
probable ratio of the blood groups of the offspring?
1:1
3:1
2:1:1
1:2:1
4:1
توضیح
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.