146 Inheritance of Specific Iso-agglutinins in Human Blood 



(d) The absence of offspring other than of Group I suggests that 

 the parents of this form were likely to have been of the constitution 

 AABB. 



(e) This form of mating should give either offspring of Group II 

 only, or else of Group II and Group IV in the ratio 3:1. In one family 

 only did a recessive individual of Group IV appear. The numbers in 

 the families are however small, and it is possible that in other instances 

 the matings may have been between heterozygotes. 



(/) This mating should bring together the two factors A and B, 

 and lead to the production of some offspring of Group I. In the single 

 family recorded ^ucH was the case. 



