In which of the following phenomena can both dominance and codominance be observed?

$A$ child with a mother of $B$ blood group and a father of $AB$ blood group will not have which of the following blood groups?

If the mother's blood group is $B$ and the father's is $A$,what blood group$(s)$ can their offspring have?

$ABO$ blood groups in humans are controlled by the gene $I$. It has three alleles: $I^A, I^B$ and $i$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

$ABO$ blood grouping in humans is controlled by the gene $I$. It has three alleles: $I^A, I^B,$ and $i$. Due to these three different alleles,six different genotypes are possible. How many phenotypes can be formed from these?

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