So, what are the distribution of the phenotypes of an offspring when we mate a male individual that contains blood group AB with a female individual that contains this blood group type. So basically, this male individual can produce one of two different types of sperm cells, either the IA sperm cell or a sperm cell that contains IA chromosome, or it can contain the IB chromosome. This can produce X cells that contains either the IB chromosome or the lowercase I chromosome. So if we carry out the punitive square, we get the following distribution of phenotypes. So in this or the following genotypes, in this particular genotype, we produce the AB group. So the AB phenotype in this particular case, one is lowercase I, the other one is lowercase B, or a lowercase a upper case I A.