18 SO .ME POSSIBLE BEARINGS OF GENETICS ON PATHOLOGY 



In the transfusion of blood from one individual to another, 

 that is sometimes necessary, it is essential that the blood corpuscles 

 of the ddiior are not agglutinated by the serum of the recipient. 



II 



aJ 



aB 



aB 



aB 





Fig. a. The upper pedigree gives the children from the family in which 

 types I and IV were the parents. The offspring belong to types II and III 

 (two of the four possible kinds of offspring). 



The lower pedigree represents three generations. The grandparents are 

 I and II and I and III. respectively, while the parents are II and III. 



'Jims it is a matter of great importance to select a donor that 

 does not bring about such a catastrophe. The simple rules are 

 that individuals belonging to the same blood group (I, II, III, 



