n] 



Structural Characters : Plants 



27 



27. The two-celled type of fruit is dominant to the 

 many-celled type in Tomato. Price and Drinkard (221). 



The case is one of the few in which the genetic behaviour of a meristic 

 or divisional feature has been investigated apart from any complexity 

 introduced by differentiation. 



Fig. 8. Cross between Abyssinian 2-row Barley and a club-headed 6-row 

 type. The middle figure shows F-^. The length of ear is increased. 

 (From Professor Biffen's specimens.) 



28. Style short, associated with large pollen grains, 

 constituting the *' thrum" type, and style long, associated 

 with small pollen grains constituting the ** pin-eyed" type. 

 Primula Sinensis and acaulis. Bateson and Gregory (17). 



The short styled type has been found in the homozygous condition in 

 P. Sinensis but not yet in P. acaulis. For the relations of these types to 

 the " homostyled " form, see p. 68. Dominance is complete. 



