THE GENETICS OF HABROBRACON JUGLANDIS ASHMEAD 



crossed with recessive females are triploid fe- 

 males showing the dominant traits of their dip- 

 loid fathers. There is no evidence of inter- 

 sexuality in diploid males or in triploid fe- 

 males unless the reduced size of ovaries and 

 near sterility of the latter indicate this. 

 Moreover their reproductive reactions are en- 

 tirely normal, the diploid males mating readily 

 and the triploid females stinging caterpillars 

 and feeding and ovipositing upon them. 



Unmated females produce azygous sons only. 

 Mated females produce azygous sons from unfer- 

 tilized eggs but in smaller numbers than do un- 

 mated females. They also produce zygous bipa- 

 rental offspring from fertilized eggs. Whether 

 the biparental offspring shall be daughters on- 

 ly or both sons and daughters depends upon the 

 relationship of the male and female used in the 

 mating. If the male is from a stock unrelated 

 to the female all the biparental offspring are 

 daughters, but if the male comes from a related 

 stock, biparental sons as well as daughters are 

 produced. 



In general the azygous and biparental off- 

 spring from a mated female occur in the same 

 ratio from the different vials through which 

 the female is transferred (a, b, c, d, etc,) 

 until her supply of sperm is exhausted. In sub- 

 sequent vials (e, f, g, etc.), azygous sons only 

 appear. 



Biparental males cannot conveniently be sep- 

 arated from their azygous brothers unless the 

 mother has a recessive trait and the father has 

 the allelic dominant. Orange-eyed females 

 crossed with wild-type (black-eyed) males pro- 

 duce black-eyed daughters and orange-eyed azy- 



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