A chemical methoil of distinguisliing genetic types of yellow i:ones in Rudbeckia. 21 7 



Table 4. 



Rudbeckia hirta, Inheritance of Red Yellow Cones. 



a) Red Yellows X Red Yellows. 



b) Red Yellows X Purples and Reciprocals, Fi Generation. 



Table 5. 

 The F2 Generation and Back-Crosses with Crosses between Purple 

 Coned (P) and Red Y'ellow Coned (RY^ Rudbeckias. 



simple Mendelian recessives. That the yellow color in the cones is not 

 determined by the same factors in the two groups is shown by crossing 



