86 Reduplication Series in Simet Peas 



Total? ... 30 30 



In one family where coupling occurred ('12, 76) the numbers were 

 sufficiently large to indicate the nature of the reduplication. There is 

 little doubt that it is on the 3 : 1 basis for although there was an 

 unexpectedly large number of cretins the proportions accord fairly well 

 with expectation ^ 



Normal Normal Cretin Cretin 



fertile sterile fertile sterile 



'12; 76 90 20 30 34 



Expectation 111-5 19 19 24'5 



It should be mentioned that the plants in this family were all light- 

 axilled. There are good grounds then for asserting that for the factors 

 N and F reduplication is on the 3 : 1 or on the 1 : 3 basis according as 

 to whether the original mating is NF x nf or Nf x nF. 



Yet it is probable that the case is not so simple as it appears at first 

 sight. Reference to Table IX shews that in two families, viz. '12, 71 

 and '12, 91, the proportions in which the four forms occur afford a 

 distinct suggestion of a 9:3:3:1 ratio. And if these two families 

 are taken together the figures 42 NF, 13 Nf, 14 nF, 5 nf make a very 

 close approximation to this ratio. 



The possibility that, where the factors N and F are concerned, there 

 may be other sorts of families than those shewing the 3 : 1 or the 1 : 3 

 reduplications is to some extent supported by the results of growing 

 on a further generation from the F-^ family '12, 76. Unfortunately 

 these did not set seed freely and only 11 i^4 families were obtained. 

 In all of them the number of individuals was relatively small, and in 

 two cases it was too small to give more than a qualitative result. 

 There are however 8 families in which all the four classes occurred, 

 and in which there are over 30 plants per family. Reference to 

 Table X shews that these families ^ fall into two distinct groups : — 



1 I do not feel clear as to the nature of Fam. '13, 47 and have therefore not included 

 it in the present argument. It may be a family on the 3:1:1:3 basis but the numbers 

 are too few for certainty. 



