Halsted: Reciprocal Breeding in Tomatoes 



171 



Table \' 



excess of the theoretical ratio and there 

 is no difference in this respect between 

 the two sets of F2 plants. The only 

 other wide deviation from the theo- 

 retical requirement is in the excess of 

 plants with coarse foliage, and par- 

 ticularly in the second cross, where the 

 ratio is near to two to one. 



The standard and dwarf plants are 

 associated with the two types of foliage 

 as shown (Table II) . 



Table II shows that the ratios for 

 type of foliage are quite close to the theo- 

 retical per cent when both crosses are 

 computed together, for the dwarfs it 

 being fully attained; but the results are 

 markedly different from this when 

 considered separately. The percentage 

 of plants with green foliage is very high 

 for the first cross, and here the seed 

 parent is the Yellow Cherry with its 

 green foliage. On the other hand, in 

 the reciprocal the percentage of the 

 plants with green foliage falls to 65, and 

 here the seed parent is the Dandy 

 Dwarf, which has yellow foliage. 



The standard and dwarf plants are 

 associated with the two types of leaves 

 as shown (Table III). 



Table III shows that the ratios for 

 type of leaves are not far from the 

 theoretical percentages when both 



crosses are computed together, but the 

 results are quite otherwise when the 

 crosses are considered separately. The 

 percentage of dwarf plants with coarse 

 leaves is very low when the seed parent 

 is the Yellow Cherry, and contrariwise 

 correspondingly high when the Dandy 

 Dwarf is the seed parent. 



The standard and dwarf plants are 

 associated with the two types of fruit 

 colors as shown in Table IV. 



Table IV shows that the ratios for 

 fruit colors are close to the theoretical, 

 excepting among the dwarf plants in 

 cross (2) in which the plants with red 

 fruits make up 90% and the Dandy 

 Dwarf (red fruited) is the seed parent. 



A summary of the last three tables is 

 shown in Table V. 



Table V shows that in cross one (1) 

 the green foliage and fine leaves are in 

 excess of the theoretical percentages, 

 while the yellow fruited plants are very 

 close to the nttmber called for by the 

 Mendelian rule. In other words, the 

 cross with Yellow Cherry as the seed 

 parent shows in the offspring the 

 Mendelian characters of this parent in 

 percentages generally in excess of the 

 theoretical number. Contrariwise the 

 reciprocal cross (2) shows the characters 

 of its seed parent, the Dandy Dwarf, in 



