(58 Mr. Darbi shire. Experimental Estimation of the [Dec. 7, 



V ■ x/ 



Rw\ R ^yg^) Y 



RW ) R ( YG ) Y 



F 



r 



^twj R (yg) y 



I I 



[0r @b] [Qy g ; 



\ / \ / 



\ / \ / 



\/ v 



Q R and R y 



/ \ / \ 



/ \ y \ 



74-03 per 25*97 per 75-12 per 24"88 per 



cent. cent. cent. cent. 



Pedigree A. Pedigree B. 



comparison of the two pedigrees, whereas in the case of cotyledon colour one 

 of the parents of the hybrids, from the self-fertilisation of which the F 2 

 generation in question arose, bore the recessive character which reappeared 

 in the proportion of 25 per cent, in that generation ; in the case of cotyledon 

 shape, neither of the parents exhibited the recessive character. Indeed, in 

 the latter case the wrinkleds which appeared in F 2 had no ancestors bearing 

 the wrinkled character for six generations behind them. 



Subjoined are details of the families in which segregation into wrinkled 

 and round occurred. Those in which I did not count the number of 

 wrinkleds are simply marked DE. The families 158.1 to 6, and 175.1 to 4, 

 fall into the unclassifiable group (see p. 64). They can, of course, be included 

 in reckoning the percentage of greens in total of families in which segre- 

 gation occurred, but not for calculating the relative numbers of families from 

 DD and DE parents. 



