Multiple alleles are present:

In $ABO$ blood grouping,there are $P$ genotypes and $Q$ phenotypes.
$\quad P \quad\quad Q$

$A$ man with blood group $AB$ marries a woman with $O$ blood group. In this situation,

$A$ male with heterozygous blood group $B$ and a female with homozygous blood group $A$ have offspring. What are the possible genotypes and phenotypes in their progeny?

What are the products of the $I^A$ and $I^B$ alleles?

Identify the wrong statement with reference to the gene $I$ that controls $ABO$ blood groups.