A B O Blood Type Genetics

January 21, 2021

As with physical traits parental genetics determines both blood type and rh factor. A person s type of blood also gets accompanied with an rh factor of positive or negative.

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The red blood cells have the type a agglutinogen.

A b o blood type genetics. Each parents donates one of two blood genes to the child. Which antigens end up on your red blood cells is determined by which version of the abo gene you have but the abo gene doesn t actually make an antigen at all. Our immune system is trained to recognize foreign substances in our body.

By the time you are six months old you naturally develop antibodies against the antigens your red blood cells lack. The ab blood type has both a and b antigens and the o blood type has neither a nor b antigen. Inheritance and blood blood type.

The red blood cells have the type b agglutinogen. Blood groups are inherited from both parents. I i a and i b the i designation stands for isoagglutinogen another term for antigen.

Predicting the blood type of your children introduction the human genetics tutorial with problem solving exercises concerning the inheritance of the abo blood group alleles has resulted in a steady stream on inquiries to the biology project from mothers grandmothers and children inquiring about the possible blood type of the father of a given child. There is another protein called rh factor. The gene encodes a glycosyltransferase that is an enzyme that modifies the carbohydrate content of the red blood cell antigens.

For instance a person with a blood type will have anti b antibodies and a person with b blood type will have anti a antibodies. Aa ab ao bb bo and oo. The a gene for blood type codes for type a antigen the b gene codes for b antigens and the o gene codes for no antigens.

Everyone has either a b ab or o type blood. Specific blood type is determined by a single gene locus with three different alleles an allele is an alternative form of a gene which we will refer to as the a b and o alleles. Since a normal individual has two copies of each gene one from each parent he or she has six different possible genotypes.

The red blood cells have both type a and type b agglutinogens. A and b are antigens that can be on the surface of a red blood cell while o just means there are no a s or b s. The red blood cells do not have any agglutinogens at all.

There are four basic blood types made up from combinations of the type a and type b antigens. The abo blood type is controlled by a single gene the abo gene with three types of alleles inferred from classical genetics.

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