

Cases of mimic mutations and secondary 



mutations in the X-chromosome of 



Drosophila melanogaster. 



By Otto L. Mohr, 



Anatomical Institute, Christiania University, Norway. 

 (Eingegangen 20. Juli 1921.) 



Contents. 



Pag. 



1. Introductory summary 1 



2. Singed .3 



The occurence of singed 3 



Description of singed 4 



The sterility of the singed females 5 



The location of the singed gene ' 7 



The combined action of singed and forked 10 



The reoccurence of the singed mutation. Singed- 10 



Valuation of singed 11 



3. Forked* 11 



The origin of forked* 12 



Description of forked* 14 



Forked* a secondary mutation 16 



4. Mutations and gynandromorphs 17 



Hairy . 17 



Forked- 18 



Gynandromorph 1819 19 



Gynandromorph (?) 136.5 21 



Literature cited 22 



1. Introductory summary. 



It is a well known fact that mutant characters somatically alike 

 may be the product of different genes. Several examples of such mimic 

 mutations are known in Drosophila melanogaster. In the present paper 



Induktive Abstammungs- und Vererbungslehre. XXVIIi. y 



