Xo. .V,(.] 



the zygotes showing the recessive eharact< 

 so, there would be no correlation. 



On the presence and absence hypothesi 

 correlation between two dominant charactf 

 rone color and horny texture must be cons 

 ferent phenomenon from a positive eorrela 

 color and waxy texture (Bateson, 1!M)!>, p 

 Tlie first ease lias to be looked upon as an e 

 traction, the second of repulsion. This ap 

 necessary com])lication. as Kmerson (1911 

 pointed out. The significant fact would se< 

 both cases may be considered as examples 



Api)reciation of the fact that many of 

 gametic coupling are examples of colierenc 

 assumed regularity in the degree of c 

 more absurd. But in spite of cn>e> of 

 result in reversal of correlation, the idea t 

 acters are represented by material particles 

 unchanged by association in the zygote 

 held. To preserve the conception of p 

 ters, theories of positional relations of uit 

 are now being proposed. Simple Mendeln 

 also be explained by positional relations of 



