106 Gametic Rediqjlication in Pisimi 



variety having wrinkled seed being crossed with a round-seeded Acacia. 

 The object of this cross was to see whether among the gametes of i^^i 

 repulsion between T and R would occurs The F^ seeds were sorted 

 into round and wrinkled by microscopical examination, and the result 

 showed that repulsion occurred. The round seed produced 502 tendrilled, 

 270 acacia. The wrinkled seed produced 264 plants, all tendrilled. 



The repulsion is presumably partial ; but if, as is likely, the gametic 

 distribution is ITR : Q^Tr : QUE : 1 tr, only one plant in 16,384 would 

 be wrinkled and acacia, so that any proof of this prediction is beyond 

 the scope of practical experiment. 



In view of the possibility that factors other than roundness might 

 couple with the factor for tendrils, crosses have been made in which 

 various factors have been introduced with the tendrilled and acacia 

 characters. No signs of coupling or repulsion have been observed in 

 F2 from such crosses. Among the pairs of characters so tested were 

 tallness and dwarfness, yellow and green cotyledons, purple and white 

 flowers, glaucous and emerald foliage, fasciated and normal gi'owth. 



1 Bateson and Punnett, Journal of Genetics, i. 1911, p. 293. 



