Everyone inherits two alleles of the gene, one from each parent. 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.

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-).

2024年12月23日 · The ABO gene determines your ABO blood type. A and B are codominant alleles, while O is a recessive allele. This leads to four primary blood types.

2018年4月2日 · There are three alleles for the ABO gene – I A, I B, and i, which produce type A, type B, and type O blood, respectively. I A and I B are dominant over i, therefore only people with ii (one gene from each parent) have type O blood.

2024年3月16日 · The genetic basis of blood types lies in the inheritance of specific alleles that encode for the antigens present on red blood cells. For example, the ABO blood group system is controlled by a gene located on chromosome 9, with three main alleles – A, B, and O.

2022年9月14日 · There are four main blood groups (A, B, AB, or O) and a Rhesus (Rh) factor (positive or negative). The blood type is passed down from our parents. The A and B alleles are co-dominant and the O allele is recessive [2]. The ABO gene is located on chromosome 9 and has three alleles, A, B and O [3].

2004年11月18日 · There are two main genes. One gene is for the ABO blood type. This gene codes for a protein that is on the surface of your blood cells. The different versions or alleles for the blood type protein are called A, B, and O. The other gene is for another protein on your blood cells called the Rh factor. The alleles are called plus (+) and minus (-).

The A and B alleles are co-dominant, meaning both can be expressed simultaneously, as seen in individuals with AB blood type. The O allele is recessive and only expressed with two O alleles present. Such genetic permutations illustrate the utility of blood type analysis in suggesting or excluding parentage.

2012年10月1日 · There are four common blood groups in the ABO system: O, A, B, and AB. The blood groups are defined by the presence of specific carbohydrate sugars on the surface of red blood cells, N-acetylgalactosamine for the A antigen, and D-galactose for the B antigen.

There are three common alleles for the gene, often represented by the letters I A (or A), I B (or B), and i (or O). With three alleles, there are six possible genotypes for the ABO blood group. However, alleles I A and I B are both dominant to allele i and codominant to each other.