Temperature sensitive viability of hybrid between Drosophila melanogaster and D. simulans.

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Abstract
The effects of temperature on viability of hybrids between D. melanogaster females and D. simulans males were investigated using various strains of both species. At 25.degree. C, the interspecific hybrids varied from lethal (temperature sensitive) to fully viable (resistant). The temperature sensitivity of the hybrid was mainly controlled by gene(s) located on the X chromosome of D. simulans male. Temperature sensitivity varied among X chromosomes within natural populations of D. simulans. The degree of hybrid temperature sensitivity can be modified by EMS [ethyl methane sulfonate] treatment in both sensitive-to-resistant and resistant-to-sensitive directions. Female D. melanogaster affect hybrid temperature sensitivity, especially in crosses with temperature-sensitive D. simulans males. The Oregon-R strain was most sensitive D. melanogaster for detection of hybrid temperature sensitivity.

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