Now, it turns out that on chromosome nine of our Carreotype, we basically have the allele the gene that codes for a special protein membrane that is found on red blood cells. So each human inside our DNA, we have a gene that codes for this protein. Now, before the protein is actually attached onto the membrane of red blood cells, it is modified in the Golgi apparatus and a carbohydrate attachment is made onto that protein to form a glycoprotein. And this glycoprotein then is transferred onto the membrane of red blood cells. And it's the terminal sugar on that glycoprotein that determines the type of blood group or blood type that our individual actually has. So basically, let's take a look at the following diagram to see exactly what we mean.