And so this case, this case and this case will always produce only protein A on the membrane of red blood cells. And this is known as blood group A. Now, let's take a look at these two cases. In these two cases, both of the alleles are found on each of one of the two chromosomes, or not both of them. But I should say one is found on one chromosome and the other one is found on the other chromosome. And so in such a case, this is what we have.