134 THE BIOLOGY OF INSECTS 



modi or whk one aoodier. In the earlier e]q)criments 

 Eui Dpc m males ^nere crossed with Japanese females and 

 the lAfiiig ^pcre all normal as regards sex, but when 

 males wa^ bred with European females the off- 

 grew into rkormal males and into females with a 

 blend of male characters. Later, when a number of 

 DCS bad been tested, it was found that " the 

 of intersexnafity is definite and ty|Mcal fcH- a particular 

 ' so that the intersexes could be sorted into low, 

 and btgh grades. Extreme members of the last- 

 group were actually males in appearance and 

 bAafkmr , and oncrosoopic cxaminatiofi o£ the refHoductiTe 

 Ofgans sl wfiMed d^eoerate egr^ tne orarian tissue becoming 

 dKp la rrd by spcmuz:. it sperms being produced. 



It is powahlc dbc - tersexes tending to 



derf^r feminine : _ .ess completehr than 



:!" ri or tr^ f rust described. 



nsects like the 



G - _, ___c ^icri^^c. L-.C sex cannot be 



t.j it: by the x or _y chromosomes. In 



r-AVc 5.een, the male is homozygous (xx) for 



- - : rs- Goldschmidt seeks an explanation for 



r rTr rs bv asM i iiBi i g the existeiice erf a factor for femin- 



7) in addrdoci to the normal male sex-factor that 



: in die X dutHDosomes. The hypothetical female 



*• purely maternal in inheritance," may be supposed 



"^ egg-cytc^lasm or in the v chromosome, 



: are believed to be produced when the 



rength c: tie —.z'e factors in the fertilised 



-.7'* - hig-h : .": zT the tendency to 



-^~ ^ : 2 - 7 ' ' ' "emale is actually 



tr_ 7 7 . results appear in 



: v»er of one parent- 



A: that these results show the 



7 ordinary tyi>e of sex- 



-iparoit doubt that such 



i}-s brought about by means 



