26 



THE MENDEL JOURNAL 



giving, upon self-fertilisation, progeny in the ratio 

 of 3 dominants to 1 recessive. 



The foregoing facts elucidated by Mendel may 

 be tabulated as follows : — 



. Hybrids, allof the dominant type, 

 1st Filial (Fj). but all containing the recessive 

 character-factor also. 



D (R) 



2nd Filial (F^,). 



Progeny resulting from the self- 

 fertilisation of the hybrids, 

 namely, 3 dominants to each 

 recessive. Two of the apparent ' D, D (R), R, 

 dominants, however, as shown in the ratio of 

 by later generations, contain ] 1:2:1 



the recessive character- factor, or as regards 

 and are therefore hybrids, like appearance onljr 

 their parents. The other domin- 3D: IK. 



ant, and also the recessive, are 

 pure and remain constant inde- 

 finitely. 



We are now in a position to consider the 

 problem which presented itself to Mendel ^vheii 

 he had made out this constant ratio of 1 Pure 

 Dominant : 2 Hybrids : 1 Pore Recessive for each 

 pair of characters among the progen}^ raised from 

 the hybrids produced by the original cross. That 

 hybrids when bred together should produce hybrids 

 was what might have been expected, but that 

 each of the two original characters should come 

 out again in a perfectly pure form, without a ay 

 tendency to produce in any subsequent generation 



