No. 610] LINKAGE IN LYCOPERSICUM 



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lation between 'the loculation of the ovary and some fruit 

 shapes, although not necessarily with the constricted type 

 of fruit. The foliage characters (Groth, 1911) are rather 

 complicated. Also the color of foliage and the color of 

 the epicarp of the fruit may be associated in the same 

 way that habit of vine and leaf surface are, i. e., the ex- 

 pressions of one factor. Dwarf plants always have a 

 more rugose foliage than standard plants. According to 

 Groth (1915, p. 17) dwarf ness can not be associated with 

 pubescent fruit for some reason. 



A list of the Mendelian genes, so far known in the 

 tomato, is given in Table VI. 



The list is only tentative. A more detailed study of 

 these characters will probably necessitate further revi- 

 sion. Other character differences may be known and 

 should be added. There are, however, at least 10 plainly 

 segregating genes and probably more. The behavior of 

 6 of these with respect to their being linked or not linked 

 with each other, in all the 15 possible combinations,^ is 

 known in the case of 7 of them and can be predicted for 5 

 others. These 15 combinations with respect to linkage 

 are summarized as follows : 



