Chai/i <?/* f^ur/'eej7 C/iro/77^S(?/nes in Oenot/tera. 



The Occurrence ^/ S eg me/1/3/ /n/'ercAa/i^e ie/ieee/j:' 



(i) IVonCbrresponcltn^ Se/zne/r/s ofO/sposite (ii) Corresponding Se^/rienh 

 Complexes Oagii/e Aa/fmutsn^s in Oe. ^^^^^ ^^'^^ Chmp/ex {^0 ^ii^e 



lamarck/ana.) ^^-^^ mutants in Oe./^ei^nMu) 



(Hi) Corresponding Se^men/'s o^ (ivj/^on- Corresponding Sej^enh 



Opposite Comp/exes (neio comhinahon o/Me Same Co/np/ex (to gii/e 

 non 'dis/u/tcAo/ta/.J change of pairing /t/pem Oe. 



pratinco/a.) 



Fig. 108. — Diagram showing normal and anomalous pairing of 

 chromosomes seen and inferred in complex-heterozygote 

 CEnothera with rings of various sizes. Segmental interchange 

 is due to crossing-over in differential segments. The first two 

 types will yield mutant gametes. The third type will give no 

 viable mutant and the fourth type will give a gamete having the 

 same properties vis-a-vis its normal partner but changed 

 properties vis-a-vis others. (C/. D., 193 1 d.) 



