Eversporting as a Function of the Y-Chromosome in Drosophila Melanogaster.

similar fashion with tertiaries to give the effect of pure-breeding types if crossing over did not take place. 4 Buchholz, J. T., and Blakeslee, A. F., these PROCEEDINGS, 16, 190-195 (1930). Blakeslee, Albert F. In press, Proceedings of the Sixth International Congress of Genetics. 6 Datura tatula differs from D. stramonium only by the dominant gene for 'purple in contrast to white flowers and D. inermis differs from D. stramonium by the recessive gene for spineless capsules. These forms seem no more worthy of specific rank than a number of gene mutations which have occurred spontaneously in our standard line of D. stramonium and seem better included in the latter species.