At the last meeting of the society I reported the occurrence of a white-eyed mutant in a pedigree culture of the fly Drosophila ampelophila. The mutant bred to his red-eyed sisters produced 1,237 red-eyed (male and female) and 3 white-eyed (male) individuals. This sporadic occurrence within the strain is due to further sporting in the eggs of certain females. The same strain has continued to produce white-eyed mutants and these are always of the male sex.
This white-eyed condition has shown itself to be sex limited in its inheritance, i. e., in certain combinations the character is transferred to one sex only. For instance—If a white-eyed male is bred to a red-eyed individual all of the offspring are red-eyed (males and females). These inbred produce red-eyed males and females and white-eyed males. The reds are to the whites as 3 to 1. Thus half of the grandsons inherit the new character but none of the granddaughters.
