Sex-limited inheritance in Lychnis dioica L. 293 



Synonymous formulae: 



(1) FFmm =: 9, FFMm = d" (Shull 1911). 



(2) 00 =9, fO^) =d (Morgan 1911a). 



(3) 00 = 9, ZO = cf (Piuney 1911). 



(4) YY = 9, XY = d' (Wilson 1910, Stevens 1911b). 

 (.5) aa = 9, Aa = cf (Baur 1911). 



(6) 9 9 =9, 9 9cf =cr (Shull 1910). 



3. The female is assumed to be a neutral homozygote. 



Model formulae: XXFF = 9, XXFM = d, 

 or simply, FF =^ 9, F31 = cT. 



This formula has been used by Shull (1911). 

 Synonymous formulae: 



(1) ff = 9, (f)m = cf (Schleip 1912). 



(2) wiv =9, ivm = c? (Correns 1907). 



(3) 99 = 9, 9d" = cf (Morgan 1911a, Smith 1906, 1910). 



(4) 99 = 9, (9)<f = (/ (Wilson 1909). 



B. The female is heterozygous, the male homozygous. 



Examples: Echinoidea, Lepidoptera, Aves. 



4. The male is assumed to he a positive homozygote. 



Model formulae: XXMm = 9, XXMM = cf, 

 or simply, Mm = 9, MM = cf . 

 These formulae have been used by Stuetevant (1912a, b) and 

 Bridges (1913 a). 



Synonymous formulae : 



(1) FFMm=9, FFMM=d (Goldschmidt 1912, 1913, 



Sturtevant 1912a, Correns and 

 Goldschmidt 1913, Goldschmidt 

 and Poppelbaum 1914, Gersch- 

 ler 1914). 

 = d" (Gerould 1911). 

 = d" (Gerould 1911). 

 = c/ (Hartwig 1912). 

 = cf (Gulick 1911). 



') This formula hecomes comprehensible when it is known that in the paper in 

 which the formula appears, Morgan does not follow the nsual method of letting the 

 lower-case letter denot« the absence of a determiner whose presence is indicated by the 

 corresponding capital. 



