82 



Redn2)lication Series in Siveet Peas 



57 red long : 129 red round — numbers not far removed from those 

 actually found. The value of n for the EL series must also be very- 

 close to its value in the BL series. 



Again in the BE series the figures obtained are much more closely 

 in accordance with the supposition that the value of n is 63 instead of 

 127 which was found to be the case where the plants were homozygous 

 for L (cf p. 80). Apparently what may be termed the normal linkage 

 ratios are upset, but this point will be considered later (p. 91). 



It may however be suggested that it is possible theoretically to 

 construct a gametic series which would give a close approach to the 

 figures obtained. Such a series is : 



In such a series the gametic relations for the separate pairs of 

 factors are : 



B and L— 13BL : 3BI : 3bL : 13bl, 



B and E— 63BE : IBe : IbE : 63be, 



L and E— 13LE : 3Le : 3IE : 13le. 



As the subjoined figures shew the theoretical results accord fairly 

 closely with the actual numbers. 



Blue 



Red 



At present however I do not wish to lay stress on this approxima- 

 tion as I am unable to picture clearly how such a gametic series comes 

 to be formed. 



(y8) Nature of mating BeL x bEI. 



Details of a number of Fo and F^ families ex Blanche Burpee 



