K. K. Nahouks 



59 



(c) In order to try out more completely the behaviour of the 

 heterozygotes derived from the crossing of leuconotus and leucothorax, 

 a leuconotus male from the second generation of an extracted leuconotus 

 culture (Exp. I, ^3) w.is mated to a leucothorax female from the second 

 generation of an extracted leucothorax culture (Exp. I, F^). The Fi 

 result was twenty-five adults, all leuconotus-leucothorax (BG). These 

 leuconotus-leucothorax heterozygotes were inbred and gave in F.^ the 

 following progeny (Table IV (c), Fy): 



ActUHl Numbers 

 Expectation 



l''i 



This result is in perfect accord with the other results, showing that 

 the first parents were homozygous, and that the F^ heterozygotes 

 behaved in a regular Mendelian manner just as did the exactly similar 

 leuconotus-leucothorax (BC) heterozygotes in Exp. I. 



(5) Results from the mating of heterozygous individuals with one or 

 the other of their homozygous parent forms. 



Experiment V. (a) A leuconotus-leucothorax (BC) male from 

 Exp. I, Fs (Table I, F^) was mated to a leuconotus (B) female sister, 

 and they gave in F^ (F4) the following results (Table V): 



Actual Numbers 

 Expectation 



Leuconotus- 

 leucothorax 

 (BC) 



20 



20 



Leuconotus 

 (C) 



20 

 20 



Fi (F,) 



TABLE V. 



Expectation 

 Actual Nuinl)ers 



FiW 



Parents (F^) 



20 

 20 



f 

 BC 



I 



f 

 BC 



BC Table I 



(^3) 



(a) 



20 

 20 



B 



t 



B 

 Extract 

 Table I 



(^3) 



67-5 

 66 



• 

 C 



I 



c 



Extract 

 Table I 



B = leuconotus. 

 C = leucothorax. 



(b) 



67-5 

 69 



• 

 BC 



I 



• 



BC 

 Table I 



(^3) 



/'i (^V 



Parents (F3) 



11—2 



