-A curious adult from Michigan
December 6, 2016
While a child could have the same blood type as one of his/her parents, it doesn’t always happen that way. For example, parents with AB and O blood types can either have children with blood type A or blood type B. These two types are definitely different than parents’ blood types!
But two O parents, for example, will pretty much always have O kids. They will match both parents.
Each specific instruction for a small part of you is called a gene. As humans, we all have the same 20,000 or so genes. What makes us different are the different versions of these genes.
For example, we all have the blood type gene, ABO. What gives us different blood types is that this gene comes in three different versions: A, B, and O.
In a simple world, the three versions would give three blood types and a child would have one of the blood types of the parents. But we don’t live in a simple world, now, do we?
I told you there are all these different genes and that they come in versions. But what exactly do they do and what is different about them?
Genes are the instructions for proteins. And different gene versions make different versions of a protein.
So the A version of the ABO genes makes the “A” version of a protein, the B version a B version of a protein and importantly, for our discussion, the O version doesn’t make either.