R P. Gregory 125 



(1) Repulsion between short-style and colour characters. 



Short-style and Magenta-colour. The results of my crosses in which 

 a short-styled coloured race (Salmon-pink, p. 109) was mated with 

 various long-styled plants carrying the magenta factor, show that in 

 the gametogenesis of the hybrids so produced, a complete repulsion 

 between the factor for short-style and the magenta factor takes place. 

 The numbers obtained in these experiments are given below, together 

 with the expectation based on the assumption of complete repulsion 

 between the two factors under consideration. 



Magenta short-styled Fj, giving niagentas and saJmon-pinks. 



Short-«tyle Long-style 



Magenta Salmon 



Observed Numbers ... 54 18 



Expected „ ... 48 24 



Tinged-white short-styled F^, giving tinged-white, magenta, and salnumrpink. 



Shortrgtjle Long-style 



Tinged-white Magenta Salmon Tinged-white Magenta Salmon 



Observed nnmbers 157 46 19 66 20 



Expected „ 173-25 38-5 1925 57-75 1925 



Tinged-white short-styled F^, giving tinged-white, magenta, saimon-pink, 



and hlrie. 



Short-style Long-style 



Tinged- Tinged- 



white Magenta Salmon Blue white Magenta Salmon Blue 



Observed nnmbers 15 4 3 2 10 6 



Expectation {omitting^ ^^.^ ^.^ ^.^ _ j,.^ ^.^ ^ 



iluet) I 



The deficiency in the tinged-white short-styles is referred to below. 



Short-style and inhibition. Certain families raised from one 

 heterozygous short-styled tinged-white (No. 51/9) have shown an 

 interesting departure from the normal distribution of the four kinds 

 of offspring. The results of the experiments made with this plant are : 



Offspring 



