Mendelian Inheritance 



189 



P2 



F2 



Figure 51. Diagram to illustrate how Mendelian inheritance would 

 occur in an infusorian (Paramecium). The circles represent a pair of 

 diverse chromosomes, the diversity being indicated by making one black, 

 the other white. The diagram shows that in successive conjugations 

 these would be distributed according to Mendelian rules. After the 

 first conjugation (P), the ex-con jugants and their descendants by 

 fission (F t ) would all have one black, one white, chromosome of this 

 pair. At the next conjugation (P 2 ), by the varied reductions and 

 matings the ex-conjugants and their descendants by fission (F 2 ) would 

 exist in the proportions: 1 white-white: 2 white-black: 1 black-black. 



