Question

A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB. What is the woman's ABO genotype and blood type?

• A. $I^A$$I^o$; Blood type A
• B. $I^A$$I^B$; Blood type AB
• C. $I^B$$I^0$; Blood type B
• D. $I^0$$I^0$; Blood type O

Answer 1

The correct option is A $I^A$$I^o$; Blood type A

First husband : IA i His child: ii
New husband: IB i His child: IA IB
Thus, the lady will have IA i as the genotype and A blood type.