WHITE— STUDIES OF INHERITANCE IN PISUM. 513 



resulted; while still others gave maples, browns, ghost maples and 

 colorless. One of the last type gave 20 maple : 6 brown : 5 ghost 

 maple : 5 non-mapled. Non-maple X non-maple segregates involv- 

 ing maple or ghost maple ancestry [Table 2^ (86)] gave no maples 

 in F^. 



Lock's (55) results are in general accord with Tschermak. 



Maple X colorless gave in F.^, maple. In F^, 38 maple: 12 gray: 

 19 colorless w^ere obtained, approximating a 9:3:4 ratio. 2 of the 

 19 colorless had ghost maple seeds, but there should have been a 

 large proportion of these ghost maples. Lock says ghost maple is 

 for some reason almost unexpressed in this particular cross (maple 

 X Victoria Marrow). 



Crosses of Fg offspring of all 19 colorless with either pure strains 

 of gray or gray with purple dots (no maple) resulted in 



7 colorless producing 17 maples: 15 non-mapled. 

 22 colorless producing all maples (over 50), 

 7 colorless producing all non-maple (over 26). 



Colorless X gray, maple, purple spots gives in F^ always gray 

 with both mapling and purple spotting. In F,, Lock (55) obtained 

 II gmp:2 gm:6 gp : 2 g:4 white or colorless (one of which was 

 ghost mapled). 



In F,, 467 offspring of these various classes were grown, none 

 of which gave results in opposition to the interpretation of the 

 genetics of seed coat colors given at the end of this review. 



3 gmp Fo plants gave : 



82 gmp : 20 gm 

 Ratio, 27 : 9 



Expected, 71.3 : 23.8 



4 gmp F2 plants gave : 



21 gp 



9 

 23.8 



9 g: 37 colorless 



3 : 16 



7.9 :42.2 



75 gmp : 24 gm 

 Ratio, 9 : 3 



Expected, 81 : 27 



48 colorless 



4 

 36 



F4 whites derived from F^ segregates of the cross just described 

 were crossed with F^ grays derived from the same source. 



