82 



Bedv pi! cation Series in Sweet Peas 



57 red long : 12!) red round — iiuinbers not far removed from those 

 actually found. The value of ii 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 tiiat the value of /( is 08 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 : 



103 BEL 

 23 BEI 

 1 BeL 

 1 Bel 

 1 bEI 

 1 bEL 

 23 beL 

 103 be I 



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

 factors are : 



B and L— 13BL : 3BI : 3bL : 13bl, 



B and E— (i3BE : 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 



giving the zygotic figures in 

 the pi'opoi'tion 



Erect Hood 



Long Round Long Round 

 477 55 2 3 



Erect 



Long Round Long Round 

 •2 4 64 139 



61 



a-5 



3-5 



2-5 



60 



120 



Expectation 4!)3 



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. 



(/8) Nature of mating BeL x bEI. 



Details of a number of F., and F^ families ex Blanche Burjiee 



