two different alleles
four different alleles
three different alleles
two different genes
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A number of human traits are the result of more
than 2 types of alleles. Such traits are said to have
multiple alleles for that trait.
Blood type is an example of a common multiple
allele trait. There are 3 different alleles for blood
type, (A, B, & O). A is dominant to O. B is also
dominant to O. A and B are both codominant.
How is it 3 alleles 
Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. A given gene may have multiple different alleles, though only two alleles are present at the genes locus in any individual.
My school this is not correct its supposed to be three different alleles which are A,B and O please correct this.
Blood type exists as four possible phenotypes: A, B, AB, & O. There are 3 alleles for the gene that determines blood type.
REF:https://hobart.k12.in.us/jkousen/Biology/multalle.htm
here are three
alleles or versions of
the blood type gene: A, B and O.
Since,
humans are diploid organisms
(meaning we carry a double set
of
chromosomes-one from each
parent),
blood types are determined by
two
alleles. There are six possible
combinations of such alleles:
AA, BB, OO,
AB, OA and OB
The correct answer is C. Three alleles(genes) Labelled A, B and O are responsible for the determination of different blood groups found in man (A, B, AB and O).
D. two different genes
Blood grouping in human beings is determined by two different genes, each with multiple alleles. The ABO blood group system, for example, is determined by the presence or absence of two antigens, A and B, on the surface of red blood cells. The ABO gene has three alleles: A, B, and O. The combination of these two genes and their alleles determines the different blood types: A, B, AB, or O.
