three of them will have group B
two of them will have group A
all the offspring will have group O
none of them will have group A
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what you said is correct this
it will be 50-50
Since both parents don't have the i allele they won't produce any offspring with the gene I
Because to produce offspring with O both parents make have the i allele
So 3 of them will be A and 3 of them will be B
The correct answer is:
B. two of them will have group A
Here's why:
Parent with AB blood group has genotype IAIB.
Parent with O blood group has genotype ii.
The possible offspring genotypes from this cross are:
IAi → Blood group A
IBi → Blood group B
So, the children can only have blood group A or B, not AB or O.
If they have six children, we expect roughly half (3) to be group A and half (3) to be group B, statistically. So B ("two of them will have group A") could be correct depending on how the options are framed probabilistically, but A (three B) would also be statistically possible.
However, the only definitely wrong answer is:
C. all the offspring will have group O – impossible.
D. none of them will have group A – also incorrect.
So among the choices, **B
