MENDELISM AND SEX 



145 



experiments, but by other experiments in sweet 

 peas. The assumption which the experimental facts 

 compel us to make is, that between the grossulariata 

 character and femaleness there is repulsion, as a 

 consequence of which the two are never carried 

 in the same germ- cell. 



Let us summarise the position before going 

 farther. The grossulariata character is dominant 

 over the lacticolor one ; femaleness is dominant and 

 carries maleness recessive, and as a correlative 

 outcome of this maleness is therefore recessive and 

 pure ; between the grossulariata character and 

 femaleness there exists repulsion. Accepting these 

 premises, we expect, on the basis of Mendelian 

 principles, the following results when the crosses 

 indicated below are made : — 



Now these expectations are fulfilled by the 

 experimental results, for the above table is but an 



* It should be borne in mind that the lacticolor character is not mani- 

 fested vvlien grossulariata is also present, and the recessiveness of the former 

 is indicated here by enclosing it in brackets. It should also be remembered 

 that all females are carrying maleness recessive and therefore not mani- 

 festing it. 



