LINKAGE RELATIONS IN MENDELISM 
107 
When the factors enter the hybrid in different relations, the segre- 
gation ratio is different. 
with white starchy, (cW)(cW), the F, is purple starchy as in the previous 
Thus when purple waxy, (Cw)(Cw), is crossed 
case. The resemblance, however, is not complete except as to phenotypic 
3.4 (CW) 1 (Cw) . 1 (cW) 3.4 (cw) 
11.56 3.4 3.4 11.56 
3.4 (CW) (CW)(CW) (CW) (Cw) (CW) (cW) (CW) (cw) 
purple starchy | purple starchy | purple starchy | purple starchy 
3.4 1 1 3.4 
1 (Cw) (Cw) (CW) (Cw) (Cw) (Cw) (cW) (Cw) (ew) 
: purple starchy purple waxy purple starchy purple waxy 
3.4 1 1 3.4 
1 (cW) (cW)(CW) (cW) (Cw) (cW)(cW) (cW) (cw) 
purple starchy | purple starchy | white starchy | white starchy 
11.56 3.4 3.4 11.56 
3.4 (cw) (cw) (CW) (cw) (Cw) (cw) (cW) (cw) (cw) 
purple starchy purple waxy white starchy white waxy 
Fig. 49.—F» checkerboard of cross between purple starchy and white waxy maize. 
1 (CW) 3.4 (Cw) 3.4 (cW) 1 (cw) 
1 3.4 3.4 1 
1 (CW) (CW)(CW) (CW) (Cw) (CW) (cW) (CW) (cw) 
purple starchy | purple starchy | purple starchy | purple starchy 
3.4 11.56 11.56 3.4 
3.4 (Cw) (Cw) (CW) (Cw) (Cw) (Cw) (cW) (Cw) (cw) 
purple starchy purple waxy purple starchy purple waxy 
3.4 11.56 11.56 3.4 
3.4 (cW) (cW)(CW) (cW) (Cw) (cW)(cW) (cW) (cw) 
purple starchy | purple starchy | white starchy white starchy 
1 3.4 3.4 1 
1 (cw) (cw) (CW) (cw) (Cw) (cw) (cW) (cw) (cw) 
purple starchy purple waxy white starchy white waxy 
Fic. 50.—F»2 checkerboard of cross between purple waxy and white starchy maize. 
expression, for its genetic constitution is (Cw) (cI), instead of (CW) (cw) 
as in the first cross. It produces a series of gametes in the ratio 
1(CW) :3.4(Cw) :3.4(cW) : 1(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 
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