What is a person's blood type determined by?

Answer 1

If a person is blood type A then they will have red blood cell antigens of A and plasma antibodies (agglutinins) called Anti-B. If a person is Type B then they will have B antigens and Anti-A antibodies. If a person is Type AB they will have both A and B antigens, but no plasma antibodies. If a person is type O then they will have no red blood cell antigens but they will have both anti-A and anti-B plasma antibodies.

Answer 2

SHORT VERSION: Marker molecules on red blood cells

LONG VERSION:Blood types are determined by two acquired genes, one from each of your parents.

Your "blood type," generally spoken is your blood phenotype, that is the physical expression of your genes. Blood type has three genetic variations, or alleles - A, B, and O.

A and B are dominant alleles, and O is recessive. That is, A and B will physically be expressed over O. Therefore, the only way you can obtain a blood type O is by having two O alleles. Because A and B are both considered "dominant," A and B can both be expressed together, as neither take dominance over the other. This results in a blood type AB.

-----------------------------------------------------------------------------------------------As Dankrescent said above that determines it. But what blood types are are chemicals. Everyone has that generic Red Blood Cell, it's just that, based on what's in your DNA, it has a chemical on it. Each chemical has been given a name. There's the chemical represented as 'A', another by 'B', and then there's 'O'. Those three are the primary blood chemicals. Then there is a fourth chemical that you either have or don't have. If you have it, it's represented with a plus (called positive).

For example: AB Positive (AB+) O Negative (O-). These blood types react differently with each other. Some are compatible and some aren't. You'll learn all about this in Life Science and Biology.

Answer 3

A person's blood type is determined by the presence or absence of specific antigens on the surface of red blood cells. The main blood group systems that determine blood type are the ABO system and the Rh system. A combination of these antigens results in different blood types such as A, B, AB, and O.

Answer 4

A person's blood type is determined by genetics, just like most everything else.

Answer 5

Either 'parents' -but it's not a straightforward link. Or 'bonemarrow'.

Answer 6

aids