6 



A MANUAL OF MENDELISM 



the first series of experiments while the other carried 

 the two corresponding recessives, and, as is to have 

 been expected, the hybrids bore the two dominant 

 characters only — the recessives both disappearing ; but, 

 when they in their turn were bred from, their progeny 

 consisted of four groups bearing the characters given in 

 the following table and standing to each other numeri- 

 cally in the ratio 9:3:3:1, thus : 



I.e. 



Round 



with 



yellow 



albumen 



315 

 9 



Round Wrinkled 

 with with 



green yellow 



albumen albumen 



108 

 3 



101 

 3 



Wrinkled 



with 



green 



albumen 



32 



1 



This again raised the question : Were the hybrids' 

 progeny hybrid or pure ? To answer it, their seeds 

 were sown, and, from the generation so produced, just 

 as in the first series of experiments, some were found to 

 be hybrid while others bred true. And not only so ; 

 for it was also found, although there were now four 

 groups of hybrids' progeny, that each group again con- 

 tained equal numbers of true-breeding individuals. The 

 following table gives the number bred from and the 

 number which bred true : 



W^rinkled W^rinkled 



with with 



yellow green 



albumen albumen 

 96 30 



28 30 



In this experiment, three results similar to those in 

 the first series are to be noted, namely : 



