ISOHEMAGGLUTININS 



177 



the two agglutinogens and their corresponding agglutinins as 

 similar to independent factors described by Mendel in his experi- 

 ments with peas. They considered that the agglutinogen factors 

 A and B are dominant to the corresponding recessives a and b. 

 They represented group genetically, which is devoid of ag- 

 glutinogens, by the double recessive aabb (see Ottenberg, 1928, 

 912). Table IV, taken from a paper by Ottenberg (1928), shows 

 the genetic formulas of the four groups as suggested by von 

 13ungern and Hirschf eld : 



Table IV 

 Genetic Formulas of the Four Groups* 



B 



aabb 



Table IV shows all of the possibilities according to the two- 

 factor hypothesis of von Dungern and Hirschfeld. For a more 

 comprehensive discussion of the genetic factors involved, the 

 student is referred to an excellent book by Snyder (1929). 



Ottenberg (1928) has also included Table V showing the groups 

 of the children resulting from all the possible crosses under this 

 two-factor theory. 



Table V* 



Determination of Nonpaternity. — Ottenberg* calls attention 

 to the possibility of "ruling out the reputed father as definitely 

 not the father of the child being examined" by a reference to the 



•From "The Heredity of the Blood Groups" by Ottenberg, R., and Beres, D., 

 in The Newer Knowledge of Bacterioloffy and Immunology, edited by E. O. 

 Jordan and I. S. Falk. Reprinted by permission of the University of Chicago 

 Press. 



