3. Sugary endosperm. The sugary endosperm which has been used in experimental work since the beginning of maize genetics is designated as su1.

A) Interrelation between sugary1 and sugary2

su1 x su2 - all starchy Su2 su2
su2 x starchy - starchy in F1 - F2 4407 1318
Backcrosses 1884 1594

  Su1 Su2 Su1 su2 su1 Su2 su1 su2
F2 from su1 x su2 9493 2991 4069

B) Relation between su2 and Y.

  Y Su2 Y su2 y Su2 y su2
F2 1930 394 393 340
Backcrosses 1065 492 577 895

C) Sugary3 in chromosome 9

  1. Relation between sugary3 and shrunken endosperm
  Su3 Sh Su3 sh su3 Sh su3 sh
17050 -4 267 18 13 113
  -7 261 71 54 90
   5 114 13 15 19

  1. Relation between su3 and pr2
  Pr Su Pr su pr Su pr su
17011 -4 184 15 17 55*
  -1 170 9 7 45*
17012 -1 157 71 78 4**

*  coupling
** repulsion