GAMETIC COUPLING AND REPULSION IN THE SILKWORM. 



14.", 



IX. Summary. 



1) Few examples of gametic coupling and repulsion, other than those 

 which occur in connectien with the sex-factor, have been found hitherto in 



2) I have ascertained however that the phenomena of coupling and 

 repulsion of certain somatic characters occur m the Silkworm as they do in 

 plants. 



3) Partial coupling in the Silkworm occurred a) between the moricaud 

 marking and yellow colour, and also b) between the striped marking 

 and yellow colour. These are, so far as I am aware, the first record 

 of partial gametic coupling found in animals. 



4) The gametic system on which the partial coupling occurred in the 

 Silkworm in my experiments was presumably of the 7 i I : 1 : 7 type in either 

 of both cases stated above. 



5) Complete coupling took place between the striped marking and 

 yellow colour. 



6) Complete repulsion was found to occur a) between the normal 

 marking and the yellow colour, b) between the striped marking and tfee 

 yellow colour, and c) between the striped and normal markings. 



March, 1913. 



