Effect of Temperature and Moisture Content of the Nutrient Medium on the Viability of Chromosomal Types in Drosophila pseudoobscura

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Abstract
Most natural populations of D. pseudoobscura are known to be mixtures of chromosomal types which differ in the gene arrangements in the 3d chromosomes. Observations in nature as well as laboratory expts. have shown that these chromosomal types differ in their adaptive values in different environments. In the present expt. the relative viabilities of the homozygotes for the Standard, Arrowhead, and Chiricahua gene arrangements have been compared in cultures with regular and with dry nutrient medium. The cultures were kept at temps. of 16[degree]C and 251. Chiricahua homozygotes find optimal conditions on the dry food and at 25[degree]C, while Arrowhead homozygotes are superior on the regular food and at 16[degree]C.

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