So on this row, in this row, we have the three different types of alleles. In this column, we have the three different types of alleles. So these alleles can come from the male parent and these alleles can come from the female parent. And so if we carry out the Punnett square, these are the nine different types of possibilities. So in this particular case, both of those chromosomes contains the alleles that code for protein A. In these two cases, one of the chromosomes contains that allele that doesn't code for anything, but the other one contains the allele that codes for protein A.