GAMETIC COUPLING AND REPULSION IN THE SILKWORM. 141 





A) Femaleness and B) black-eye 











. a) Maleness and b) pink-eye charac- 



complete 





1908 





A) Femaleness and B) masking or 









Fowl 



suppressing factor, 

 a) Maleness anti 6) absence of mask- 

 ing factor. 



complete 



Bateson ami 



1908 



— 



Fowl 



a) Maleness and non-barred character. 



complete 



"TVaTlTui.l - 

 M |W. ai.d 



T908 

 1910 

 1911 





A) Femaleness and B) dominant 





Hagedoorn. 



1909 



Fowl 



«) Maleness and b) absence of domi- 





Bateson and 



1911 







As t 







he above list shows, there have been c 



bserved a great 







coupling 



ind repulsion in plants. Several case 



s of complete repulsion and 





But all of these interesting phenomena in animals were found in connection 

 with the >< x-rliaractcr. There is no case of coupling or repulsion known 

 to occur independently of that factor. Furthermore the phenomena of the 

 partial coupling and partial npulsion have been found hitherto only in the 

 vegetable world. 



According to Bate-on, a coupling or a repulsion results from an unequal 

 occurrence of the various gametic forms in the gametogenesis of a hetero- 

 zygote, as has been mentioned at the beginning of this paper. The coupling and 



