550 



WHITE— STUDIES OF INHERITANCE IN PISUM. 



Colored axils, colored flozvcrs X non-colored axils, white flowers 

 gives in F^ colored axils, colored flowers. In Fo the following re- 

 sults have been obtained : 



In F3, Mendel grew the progeny of 100 of the Fg colored flower, 

 colored axil segregates and found 36 bred true, while 64 again gave 

 both the Fo classes in similar proportions. In F4 Mendel secured 

 no exceptional results. 



Lock's results (56) from selfing Fj colored flower, colored axil 

 segregates confirmed Mendel's results, part of them breeding true 

 and a greater proportion giving both classes again. 



Back-crosses of F^ X colored flowered, colored axil parent gave 

 all progeny with colored flowers and axils. 



F^ crossed with a white-flowered, non-colored axil variety gave 

 44 progeny with colored flowers and axils and 26 with white flowers. 



Fo white-flowered segregates X pure-colored flower, colored axil 

 varieties gave all colored flower, colored axil offspring. 



Non-colored axils, colored flozvers X the same breeds true. 



Non-colored axils, colored flozvers X non-colored axils, white 

 flowers in Fj gives all colored flowers and colored axils. In Fo, 

 Tschermak (86) obtained from a population of 545 : 



The proportion of segregates with colored flowers and colored 

 axils to those with colored flowers and uncolored axils was 336:83 

 or 4: I, whereas the theoretically expected proportions were 314.25: 

 104.75 or 3:1. 



Extracted white-flowered segregates derived from the splitting 

 up in later generations of the Fj segregates with colored flowers and 



