Inherited Genes

How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 173 CE courses, most popular
$95Add to cart
Pick Your Courses
Up to 8 CE hours
$50Add to cart
Individual course$20Add to cart
Need multiple seats for your university or lab? Get a quote
The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Introduction to the ABO Blood Group System (online CE course)
Inherited Genes

The A, B, and H antigens, like many other blood group antigens, are the expression of genes inherited from the previous generation. If the antigen is demonstrated, the gene controlling it must have been inherited from one or both of the parents.
As previously mentioned, the genes A, B, and O are allelic genes. Assuming the production of H substance, these three genes, in various possible combinations of two, account for the four recognized ABO groups: A, B, AB, and O. Each individual inherits two ABO genes, one from each parent, and these genes determine which ABO antigen will be present on that individual’s red cells. These genes exhibit co-dominance, meaning that if both A and B genes are present, both will be expressed.