4 A MANUAL OF MENDELISM 



Having bred the hybrids, the next part of Mendel's 

 work, which was that overlooked by earlier observers, 

 was to breed them on to another generation and 

 examine their progeny. Accordingly, seeds of all the 

 seven kinds were sown, and their progeny, when arranged 

 and counted, were found to consist, in every case, of 

 both the original parent kinds again, but in the propor- 

 tion of three dominants to one recessive. The following 

 table gives the actual figures and their proportions : 



Hybrids Their Progeny Proportions 



1. Round seeds Round 5474 Wrinkled 1850 2-96 



2. Yellow albumen Yellow 6022 Green 2001 3-01 



3. Coloured seed-coat Coloured 705 White 224 3-15 



4. Plain pods Plain 882 Constricted 299 2-95 



5. Green unripe pods Green 428 Yellow 152 2-82 



6. Axial flowers Axial 651 Terminal 207 3- 14 



7. Long stems Long 787 Short 277 2-84 



This result raised the question : Are these hybrids' . 

 progeny hybrids again like their parents or true- 

 breeding individuals like their grandparents ? To 

 settle it, they, in their turn, were also bred from, and, 

 judged by their progeny, one only in every three 

 dominants bred true while all the recessives did so. 

 The dominants which did not breed true threw domi- 

 nants and recessives in the proportion 3:1, just as 

 their hybrid parents had done, and,'by doing so, showed 

 themselves to be hybrids of the same kind. The 

 following table gives the actual numbers of dominants 

 and recessives among the hybrids' progeny which did 

 or did not breed true : 



