LINKAGE RELATIONS IN MEN DELI SM 



107 



When the factors enter the hybrid in different relations, the segre- 

 gation ratio is different. Thus when purple waxy, (Cw)(Cw), is crossed 

 with white starchy, (cW")(cW), the FI is purple starchy as in the previous 

 case. The resemblance, however, is not complete except as to phenotypic 



3.4 (CW) 1 (Cw) 1 (cW) 3.4 (cw) 



3.4 (CW) 



1 (Cw) 



1 (cW) 



3.4 (cw) 



FIG. 49. F 2 checkerboard of cross between purple starchy and white waxy maize. 



1 (CW) 



3.4 (Cw) 



3.4 (cW) 



1 (cw) 



1 (CW) 



3.4 (Cw) 



3.4 (cW) 



1 (cw) 



FIG. 50. Ft checkerboard of cross between purple waxy and white starchy maize. 



expression, for its genetic constitution is (Cw)(cW), instead of (CW}(cw) 

 as in the first cross. It produces a series of gametes in the ratio 



l(CTF) :3.4(Cw>) : 3.4(cTF) : l(cw). 



In this ratio the numerical proportions of the gametes are reversed. 

 This is due to the fact that here the original factor combinations, C and 



