GAMETIC COUPLING AND REPULSION IN THE SILKWORM. 
139 
B- Animals. 
Animal name 
Characters 
System 
Author 
Year 
Drosophila 
(Fruit-fly) 
A) Sex-factor and B) pink eye-colour. 15 
a) ‘No sex-factor and h) orange eye. 
complete 
Morgan. 
1911 
Drosophila 
A) Sex-factor and B) eye-colour 
producer. 
a) ‘No sex-factoid and b) white eye. 
complete 
Morgan. 
1911 
Drosophila 
A) Sex-factor and B) long wing. 
a) ‘No sex-factor ’ and b ) short wing. 
complete 
Morgan. 
1911 
II. Gametic Repulsion. 
A. Plants. 
Plant name 
Characters 
System 
Authors 
Year 
Sweet Pea 
A) Erect standard and B) blue factor. 
a) Hooded standard and b) red colour. 
complete or very 
high intensity. 
Bateson, 
Saunders, and 
Punnett. 
1908 
Sweet Pea 
A) Dark axil and B) fertility. 
a) Light axil and b) sterility. 
complete 
Bateson and 
Punnett. 
1911 
Sweet Pea 
A) Normal flower-form and B) fer- 
tility. 
a) ‘ Cretin ’ type and b) sterility. 
1 :3 :3 : 1 
Bateson and 
Punnett. 
1911 
Sweet Pea 
A) Blue factor and B) long pollen. 
a) Red colour and b) round pollen. 
1 : 7 : 7 : 1 
Bateson and 
Punnett. 
1911 
1 1 1 
1) The pink colour is always accompanied by the sex-factor, but the sex-factor may 
exist without pink eye. 
2) Morgan assumes that the individuals which involve two sex-factors are female, and 
those which carry only one sex-factor are male. 
