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The behaviour of two "meiotic drive" systems, Segregation-Distorter (SD) and the sex chromosome sc(4)sc(8) has been examined in the same meiocyte. It has been found that the two systems interact in a specific way. When the distorting effects of SD and sc(4)sc(8) are against each other, there is no detectable interaction. Each system is apparently oblivious to the presence of the other, gametes being produced according to independence expectations. However when the affected chromosomes are at the same meiotic pole an interaction occurs; the survival probability of the gamete containing both distorted chromosomal products is increased, rather than being decreased by the combined action of two systems.

MULTIPLE MEIOTIC DRIVE SYSTEMS IN THE DROSOPHILA MELANOGASTER MALE