336 



PERMANENT HYBRIDS 



Complex //eterozy^ote 



Aa Aa 



A 



AK Aa Aa 3:^ 

 Sex Heferozy^otes 



XX9 XY^ 



X X 



X y 



XXq XYc^ 



(Dip/oid Di//eri'nfiahon) 



xy 



/ \ 



xo ycf 

 \ / 

 XY 



(Hsp/oid Differen/-iaNon) 



Fig. 104. — Scheme of inheritance in complex and sex heterozygotes 

 showing that elimination of homozygotes in the one and the exigencies 

 of reproduction in the other secure permanence in the system. 



male or the female. Where, on the other hand, differentiation is in the 

 haploid phase , the diploid undifferentiated generation is heterozygous 



