SEXUAL DIMORPHISM OF GAMETIC SERIES 

 IN THE REDUPLICATION. 



By 



Y. Tan.uca. 



'^ m m m ^ (D m 



B3 4» ü RJ 



In all instances of the reduplication hitherto investigated by various authors 

 it was assumed if not proved, with exception of a few disjjuted cases,'' that the 

 gametic series follow an identical system, so far as the character are not sex-limited, 

 in the male and female. My experiments with silkworms, however, furnish a positive 

 evidence for possibility of dissimilar distribution of gametes among the opposite 

 sexes, i.e. sexual dimorphism of gametic series. Such was the case with the 

 reduplication between the yellow cocoon colour and one of the larval markings such 

 as the normal, morieaud, and striped. 



In these examples the reduplication in male gametes is a partial reduplication 

 of low intensity, while the redujplication is complete in female. They may be 

 graphically expressed as follows : 



aB 



1 







AB 



Coupling 

 Repulsion 



Ab 



1 







ab 



Where 



n = 2 or 3. 



A =Epi static marking 

 B= Yellow colour 



a = Hypostatic marking 

 b = White colour. 



Two categories of the reduplication will conveniently be dealt with under 

 distinct sections. 



1) Those of Gregory (.Tour. Gen. Vol. I. No. 2.) and Saimders (Jour. Gen. Vol. I. No. 1 and i). 



