i8 BREEDING 



the closer will the actual result approximate to the 

 Mendelian expectation. This is a very important 

 question, which will be dealt with later. 



In the course of the description of the Mendelian 

 phenomenon, which is diagrammatically represented 

 in the frontispiece, it was said that certain of the 

 results were what we should have expected them to 

 be if we looked at the whole pedigree from a certain 

 point of view, namely, that of stability in breeding. 

 They are what they would be expected to be by anyone 

 who had no knowledge of the Mendelian phenomenon, 

 and who looked at them from the point of view of 

 stability. For instance, the true breeding of the 

 dwarfs in the second hybrid generation was in 

 harmony with the fact that only one kind of dwarf, 

 a pure breeding one, occurred in the ancestry of 

 the cross. And, similarly, the fact that there are 

 two kinds of tails, a hybrid and a pure, in the second 

 hybrid generation, is in harmony with the fact that 

 there are two kinds of tails, a hybrid and a pure, 

 in this ancestry. 



But, beyond this, most of the results we have 

 described differ widely from what current notions of 

 heredity would lead us to expect them to be. In 

 the first place the general expectation, as to the 

 result of crossing a tall with a dwarf would probably 

 have been that the resultant hybrid would have 

 been intermediate in height between its two parents. 

 But the individuals composing the first hybrid 

 generation are all tall, as we have already seen. 

 Intermediates between tall and dwarf have never been 



