And so in these three cases, we're going to have blood group B. And finally, this is the only case in which neither of the proteins will actually be expressed because both of those chromosomes contain this particular allele that doesn't code for either of the two proteins. So now that we know what Codominance is, and the fact that Abo blood group tray follows this mode of inheritance we call Codominance, let's take a look at the following example. 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.