124 SEX INHERITANCE 



nucleus should give rise to male parts. Another 

 suggestion was made by Morgan, namely that one 

 sperm fuses with the egg nucleus and gives rise to 

 female parts, while another sperm that has also 

 entered, develops independently and produces male 

 parts (Fig. 36 K, B). It is known that more than 

 one sperm may enter the egg of the bee. A third 

 explanation is offered by the theory of elimination 

 of a daughter X-chromosome (Fig. 36 K, C), as 

 in Drosophila. This explanation would apply in 

 those cases where the bees were hybrids, provided 

 the racial characters that were involved in the 

 Eugster bees and in von Engelhardt's bees are 

 carried by the sex-chromosome — a point not yet 

 determined. 



Intersexes and Sex 



As first shown by Brake, remarkable mosaics of 

 male and female characters are found in hybrids 

 between the European and Japanese varieties of 

 gipsy moths Porthetria dispar and japonica, when 

 the cross is made one Avay but not when made the 

 other way. We owe to Goldschmidt not only a 

 most complete account of such hybrids but also of 

 hybrids between several Japanese local varieties of 

 this moth. A most astonishing series of mixtures 

 of male and female characters come to light, not 

 as sporadic occurrences, but as regular phenomena 

 of the crosses. In his earher work Goldschmidt 

 called these mixed forms gynandromorphs, but his 



