$A$ 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 $A B$.

What is the women's $ABO$ genotype and blood type?

A child with mother of $O$ blood group and father of $A$ blood group, will have the following blood group.

If a human mother has ‘$O$' blood group, the foetus would die if the blood of foetus is

If two persons with $‘AB’$ blood group marry and have sufficiently large number of children, these children could be classified as $‘A’$ blood group: $‘AB’$ blood group : $‘B’$ blood group in $1 : 2 : 1$ ratio. Modern technique of protein electrophoresis reveals presence of both $‘A’$ and $‘B’$ type proteins in $‘AB’$ blood group individuals.This in an example of

Blood group of the father is $A$ and blood group of mother is $B$. Then predict the blood group of the progeny -

In the $ABO$ system, of blood group which of the following is example of co-dominance ?