118 
S. IKENO : 
magenta contain 126 magentas and 30 reds, theoretically 117±5-4 and 
39±5-4 respectively on 3:1 basis; further, we have seen that the F- 
generation ex red X orange (or orange x red) (p. 101) as well as that ex 
magenta x orange (p. 112) segregate each into 3 : 1 respectively, i. e. 
1. CCBBbb x CCrrbb 
(red) X (orange) 
2. CCBBBB x CCBBbb 
(magenta) X (red) 
3. CCBBBB x CCrrbb ; 
(magenta) X (orange) 
consequently we should have in (3) the segregation 9:3:4 instead of 3 : 1, 
were it not for the complete linkage between B and B, as was stated before 
(p. 114 ff.) Oar present case is very similar to that of Aquilegia leaves, green, 
cMorina and variegata, the well-known so-called “ Dreieck ” of Baue 1 2 or to 
that of the Babbit, self-coloured, Himalayan and albino studied by Punnett., 
Thus, for instance, we have in Aquilegia 
1. aciBB x aabb \ 
(green) x ( chlorina ) 
2. A Abb x aabb 
(■ variegata) X ( chlorina) 
3. aaBB x AAbb 
(green) x ( variegata) 
and in the Babbit 
1. CCSS x CCss 
(self-coloured) x (Himalayan) 
2. CCss x ccss 
(Himalayan) x (albino) 
3. CCSS x ccss 
(self-coloured) x (albino) 
1 Zeitsch. f. ind. Abstamm, u. Vererbungslehre, Bd. 6, 1912, pp. 215-216. 
2 Juurn. of Genetics, Yol. 2, 1912, pp. 236-237 ; also ibid., Yol. 5, 1915, pp. 45-46. 
