Which of the four couples claiming the baby with O+ type of blood type are possibly the biological parents of it?

1 AB negative and A +
2 A + and O negative
3 O + and AB +
4 B negative and O negative.

Dear student,
Please find below the solution to the asked query

The correct option is 2.

The possible parents will be A⁺ and O^-. The possible genotype of parent with A⁺ blood group will be I^Ai Rh positive and the genotype of O^- parent will be ii.

Now crossing I^Ai Rh positive with ii, the possible offsprings will be I^Ai Rh positive (A⁺ blood group)  and ii Rh positive (O⁺ blood group). Hence the option 2 is correct. 



 
Hope this information will clear your doubts about the 
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
 
Regards