312 R. M. STRONG. 



their ovaries are removed. The processes involved in determining 

 the sex which dominates the organism may be the same whether 

 one or both sexes are represented in it. So-called "spurious 

 allelomorphism" is not assumed in this scheme. 



This alternative interpretation may be applied to the ring- 

 doves as follows. The female determining gamete is designated 

 by the letter , as a subscript with an additional letter w in the 

 case of the white male bird. All male gametes are designated by 

 the male sign and female signs are used for the female gametes. 

 These symbols are used thus with the hope that the formulae 

 may be more easily read, and also because it does not seem to the 

 writer to be very appropriate to designate sperms, for instance, 

 by both male and female signs as is commonly done when the 

 male is regarded as heterozygous or to call eggs male and female 

 as is done when the female is considered as heterozygous for sex. 

 Both sexes are represented under the head of composition because 

 the zygote is the result of a union of male and female gametes. 

 Characters which are recessive to others in the same individual 

 are included in parenthesis. In the case of FI females, the 

 effect is interpreted as changing B to W. 



I. Blond ring-dove male White ring-dove female. 



composition B d" B ( 9 ) W 9 (W d 1 ) 



fB d 1 W 9 



producing gametes 



w 



B f d" W 9 



FI Blond males. Blond females. 



B c? (W 9) B 9 (W cf) 



2. White ring-dove male Blond ring-dove female. 



composition W cT ( W 9 ) B 9 B ( d" ) 



W d 1 B 9 



producing gametes , 



FI Blond males, white females, and occasionally blond 



females. 



B cf (W 9) W 9 W (c?) B 9 (W <?} 

 That the females in mating No. 2 are mostly white is explained 

 by the assumption already made that the female determining 

 gametes (subscript ,) of the male white bird are responsible for the 

 absence of pigment. The w effect may or may not be connected 

 with an accessory chromosome. 



