64 



PHYSIOLOGICAL GENETICS 



It has to be added, however, thai in this case the presence of a 

 series of multiple allele- is made probable bu1 qoI s1 rictly proved, 

 as the special conditions of complex heterozygosis in Oenotheras 



-- 46 

 -- 45 

 -- 44 

 -- 43 



42 Cn ■ Cn A Hookeri • ''Hookeri from I ><•. Bookeri. 



4! 



40 Crj ■ Crs albicans • flavens from ()e. suaveolens sulfurea. 



39 



38 



37 



36 



35 



34 



33 



32 



31 



30 Cr3 • Cn[albicans • albicans from Oe. hie. sulfurea Hannover]. 



29 

 -- 28 



Kl.W__ 



-- 11 



26 5 Cn • Cn [rubens • rubens from Oe. bi. sulfurea Hannover]. 



26' 



2S.5 



25 



— 24 cn • cn [albicans ■ albicans from Oe. bi. cruciata A 2a]. 



jzt + 23 



22 cn • cn Irubens • rubens from Oe. bie. cruciata A 2a]. 



1¥ 4 21 



20.5 cn • en [gaudens • gaudens from Oe. Lam. cruciata]. 



19 

 18 

 17 

 16 



15 

 14 

 13 

 " " ]?, cn • cn [velans velans from Oe. Lam. cruciata] 



10 

 9 



en ■ crt albicans ■ rubens, Oe. bie. cruciata apetala. 



y 



Fig. 22. — Graphic representation of the relative effects of the genes Cr — cr. 

 In brackets, combinations that may not be obtained. Kl I -VII, phenotypic 

 classes; cr 1-5, cruciate genes of increasing potency. [From Oehlkers, 1930, 

 Ztschr. f. Bot. {Oltmann Festschr).} 



make a complete proof rather difficult. It would be interesting 

 to try to formulate a more detailed view of genie action in this 

 case. Unfortunately, the basic facts concerning developmental 



