 Now, co-dominance is a situation where both alleles are expressed fully. So in heterozygote, again, you have a unique phenotype. So co-dominance, you have a unique phenotype, but both alleles are expressed. I have two examples of this. First of all, you have blood type. You can have type A blood, you can have type B blood, or you can have type AB blood. This is an example of co-dominance because both A and B are dominant alleles, and if you have type AB blood, you've got both of those alleles present, you have a different phenotype that is the full expression of both of those alleles. Another example of this is a cow color. There's a cow, what, variety? Here's my pretty little white cow. Here's my pretty little red cow. You combine them together, you get a cow called a roan cow. And if you look closely, it's the expression of red cow bits and white cow bits. And that is an example of co-dominance. Now blood type, my blood type example, is also an example of the next one. So let's stick with the blood type here example. It is co-dominant, but it also has multiple alleles. And let's look closer at the genetic situation with blood typing.