ShuU: Three New Mutations 



563 



POT-GROWN ROSETTE OF FUNIFOLIA 



The conspicuously revolute development of the basal portions of the leaves is characteristic 

 of this mutant. Photograph by James P. Kelly. (Fig. 16.) 



in the ratio 62 : 32, — almost exactly 

 the 2 : 1 ratio expected in such a case. 



Vetaurea and sidfurea possibly allel- 



OMORPHIC 



There were some losses of plants in 

 this family by death, and a small 

 number, especially of the slow-growing 

 decipiens type, failed to bloom. Of 

 those which bloomed there were in the 

 (a) group 40 yellow : 13 vetaurea, 

 and in the (b) group two yellow: seven 

 vetaurea. While these numbers are 

 too small to allow one to place any 

 dependence on their validity as a 

 measure of the relative positions of the 

 factors involved, it will be noticed 

 that they assume the form of a linkage 



ratio, which gives a preliminary hint 

 that the vetaurea factor is in chromo- 

 some I where the characteristic zy- 

 gote lethals occur, and the amount of 

 crossing over between the lethals and 

 the vetaurea factor seems to be about 

 the same as that between the suljurea 

 factor and the lethals. It will not be 

 surprizing therefore if the vetaurea 

 factor should be found to be allelomor- 

 phic to the suljurea factor. The 

 necessary steps have been taken to 

 test this and many other problems 

 which the presentation of this new unit- 

 factor has suggested. An alternative 

 hypothesis regarding the relation of 

 vetaurea color to yellow and sulfur is 

 also being tested. 



