Studies of Teratological Phenomena. 



115 



crosses with 402, the Aa and Bb classes were always easily dis- 

 tinguished. In the dihybrid cross under discussion then, an F2 ratio 

 of 1 AABB : 2 A ABb : 2 AaBB : 4 AaBb : 1 AAbb : 2 Aabb : 1 aaBB : 2 aaBb : 



Fig. 25. Typical flowers from F^ segregates of calycanthemy X fasciation, each 

 flower representing one of the 9 somatic classes. Beginning at the top and left, 

 they are (a) AABB, AaBB, AABb, AaBb (b), aaßß, aaBb, AAbb, Aabb, aabb. 



laabb was to be expected, the 9 gametic classes all being identifiable 

 (Fig. 25 and 26). The actual results obtained by growing 477 

 plants from three different Fi individuals bore out these con- 



