645] SHORTER ARTICLES AND DISCUSSION 



cal characteristics of husband and wife be due primarily to the 

 tendency to marry within the same racial group, one might ex- 

 pect a large correlation for cephalic index. Instead we find 

 the lowest correlation of the three determined. 



J. Arthur Harris, 

 Albert Goyaerts 



Cold Spring Harbor, L. I. 



A GYNANDROMORPH IN DROSOPHILA 

 MELANOGASTER ^ 

 In 1916 Hyde and Powell described a mosaic female with 

 one eye eosin and the other blood. They interpreted this case 

 in the light of Morgan's suggestion of 1914 that ''Gynandro- 

 morphs and mosaics may arise through a mitotic dislocation of 

 the sex chromosomes." In other words they believed one X 

 chromosome carrying the gene for eosin went into the cells of 

 one eye and the other X chromosome carrying the gene for 

 blood went into the other eye. In 1919 Morgan and Bridges 

 described a lai^e number of gynandromorphs. The hypothesis 

 of chromosomal elimination explains most of them, but a num- 

 ber of special cases are explained in other ways. One of their 

 special cases was a male with one eye eosin and the other eosin 

 vermilion. They explained this case by assuming that the egg 

 had two nuclei, one of which after maturation had an eosin 

 vermilion X chromosome and the other an eosin X chromosome. 

 Further, they assumed each nucleus to have been fertilized by 

 a Y sperm. These hypotheses would explain the facts that the 

 individual was male throughout and that one eye was eosin 

 vermilion and the other eosin. 



In our experiments a somewhat similar mosaic appeared. 

 The individual was made throughout, with one eve garnet and 

 one white. The parentage was as follows: a garnet male was 

 mated to a yellow white female. An wild-type daughter 

 was mated to an F^ yellow whife male. From this pair of 

 parents the mosaic arose. It was fertile and was bred to a 

 garnet female. In F^ all males arid females were garnet. The 

 Fj garnet males and females were inbred. In F^ the females 

 were garnet but the males were garnet and white in approxi- 

 mately equal numbers (1,089 garnet to 1.026 white). This 

 demonstrates very clearly that the mosaic was genetically a 

 1 Zoological Laboratory Contribution No. 191. Indiana University. 



