Biology
NULL
Medium
Question
If a man having blood group AB marries a woman who is heterozygous for blood group, what is the probability of their first child having blood group B?
A
0.4
B
0.45
C
0.5
✓ Official correct answer
D
0.71
Community credibility
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A
0.4
No member explanations yet for this option.
B
0.45
No member explanations yet for this option.
C
0.5
No member explanations yet for this option.
D
0.71
No member explanations yet for this option.
Explanation
If the woman is heterozygous specifically for blood group B (genotype I^B i) and the man is blood group AB (I^A I^B), then a Punnett square cross shows a 50% probability that their first child will have blood group B.