Time of Temperature Sensitivity of Meiotic Drive in Drosophila melanogaster

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Abstract
In a line demonstra-ting meiotic drive, which results in a recovery of 67% female offspring, representing a surplus of X-bearing over Y-bearing sperm, it was found that this effect could be nearly nullified by temperature treatment. A series of experiments were carried out to determine at what stage of the life-cycle the change from the optimum temperature of 25[degree]C to 18[degree]C is effective. The effect is observed to occur during a part of the process of spermatogenesis, either during the primary spermatocyte stage or extending through this and the meiotic divisions which follow.