Abstract
This chapter discusses the inheritance of the ABO blood group. The presence of antigens in the red cells is determined by genes. The genes are carried on chromosomes that are present in the nucleus of all cells of the body. Two laws of inheritance have been proved in accordance with Bernstein's theory: (1) the offspring cannot possess the antigen A or B, alone or in combination, except that it be inherited from one or both parents, (2) the parent of group AB cannot produce an offspring of group O, nor can a parent of group O give rise to a child of group AB. This is because the group AB is heterozygous so that the A gene must come from one parent and the B gene from the other.
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