SEX INHERITANCE 123 
a 
Fig. 36.J—Diagram giving the explanation of the gynander in Fig. 
36.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. 36K.—Diagram illustrating three theories of gynandromorphism 
A, Boveri’s theory of partial fertilization; Morgan’s theory of super- 
numerary sperm; C, theory of elimination, as in 36H. 
