SEX INHERITANCE 



123 



RJt*Z 



Bana-V/ 



Fig. 3G.J — Diagram giving the explanation of the gynander in Fig. 

 3tj.I by means of a binucleated egg. 



of the flies. One possible explanation has been 

 suggested by Boveri, namely, that a sperm enters 

 an egg that has already begun its first division and 

 fuses with only one of the resulting nuclei from the 

 first division (Fig. 36 K, A). This double nucleus 

 should produce female parts, while the single 



Fig. SOK. — Diagram iMiisI rating thror theories of gynandromorphi.sm 

 A, Bovcri's theory of partial fertilization; Morgan'.s theory of super- 

 numerary sperm; C, theory of elimination, as in 3011 



