Human blood type is determined by a three-allele system at a single locus. Can there be an AB child from the marriage of an A to an O.
Genes are the specific codes of these amino acids which produces a protein and alleles is the variants of these gene. For suppose there is a gene which determine the height of a pea plant and alleles are the variants types tall and dwarf.
In diploid organisms there is place for fitting of two alleles even through there are 3 or 4 alleles for the genes.
Blood type is determined by the ABO blood typing genes. These are 3 sets of genes in which A and B genes are dominant and O is recessive.
A blood type people have A antigen on the RBC cell surface.
B blood type people have B antigen on the RBC cell surface.
AB blood type people have A antigen and B antigen on the RBC cell surface.
O blood type people have NO antigen (antigen is absent) on the RBC cell surface
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