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How Blood Groups aro Inherited, group system is controlled by, A person has one of the four blood groups: A, B, AB or O, This blood, IA and I" show no, denoted by the symbols 1A, and O.The genes, a gene which hastlhrer ditterent forms, over, genes IA and " both are dominant, However,, codominant., is,, they, are, thal, other,, over, each, doinance, genes IM and "., the gene I, In other words, the blood gene 10 is recessive in rclation to, one person can have only two ot, Although there are three gene forms (called alleles) for blood, but any, them So, the blood group of a person depends on which, wo forms of the genes he possesses., the genotype (gene combination) is A IA, then the, blood group of the person is A. And if the genotype, is1 1O even then the blood group is A (because IO is, a recessive gene),, i) If the genotype is 15 15, then the blood group of the, person is B. And if the genotype is I51O even then, the blood group is B (because 1is a recessive gene)., (üi) If the genotype is IA]5, then the blood group of the, person is AB., (i) If the genotype is I°IO, then the blood group of the, Figure 19. There are four bloed groups:, person is O., A. B. AB. O., Let us solve one problem now., Sample Problem. Aman having blood group A marries a woman having blood group O and tthey have, a child. What will be the blood group of the child ?, Answer. The answer to this question depends on whether the blood group A of the man has gene, combination, or 1AI, When the blood group A hasgenotype 1AJA. In this case the genotvpe ofman's blood, and, group, gene, thatofwoman's blood is 19JSo,the child will, over, 1, (because, the, A, have blood, is dominat, , If, , B, , AB, , A, , S, , gene, , 1)., , is, , man's bloo rrup., WDmam's blovel, , >STA, , gm, , I", , IATSo, , The elijd, , blezd Gro