How many genes determine your blood type?

How many genes determine your blood type?

ABO Blood Type Just like eye or hair color, our blood type is inherited from our parents. Each biological parent donates one of two ABO genes to their child. The A and B genes are dominant and the O gene is recessive. For example, if an O gene is paired with an A gene, the blood type will be A.

How many possible genetic combinations for blood type are there?

Because we have two copies of the blood type gene and there are three possible versions of this gene, there are six possible combinations. Officially complicated! They are: These are called blood type genotypes.

How many allele combinations can give you a type blood?

three different alleles
There are three different alleles for human blood type, known as IA, IB, and i. For simplicity, we can call these alleles A (for IA), B (for IB), and O (for i). Each of us has two ABO blood type alleles, because we each inherit one blood type allele from our biological mother and one from our biological father.

How many genes control blood type in humans?

The ABO blood group system was the first genetic polymorphism discovered in humans. It consists of three alleles: two co-dominant A and B alleles, and one silent and recessive O allele[1]. The system is controlled by a single gene at the ABO locus.

What are the 3 genes for blood type?

Human blood type is determined by codominant alleles. There are three different alleles, known as IA, IB, and i. The IA and IB alleles are co-dominant, and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, and type O.

What determines blood type?

Blood types are determined by the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a patient’s immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching.

How is a person’s blood type determined genetically?

Blood Type Is Determined Genetically. A third version of this gene, the O allele, codes for a protein that is not functional; it makes no surface molecules at all. Everyone inherits two alleles of the gene, one from each parent. The combination of your two alleles determines your blood type.

How does the combination of two alleles determine your blood type?

The combination of your two alleles determines your blood type. The table on the left shows all of the possible combinations of blood type alleles. The blood type for each allele combination is shown on the right. For example, if you inherit a B allele from your father and an A allele from your mother, your blood type will be AB.

How are the four major blood groups determined?

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types ( A+, A- , B+, B- , O+, O- , AB+, AB- ).

How is the Rh factor related to blood type?

For example, if an O gene is paired with an A gene, the blood type will be A. For instance, a parent with O blood with 2 O genes and a parent with A blood with 2 A genes will have an A blood type child with one A gene and one O gene. The Rh factor is simply a protein that is found on the covering of the red blood cells.