There are certain distinctions in firmness to the high temperature and photo sensitiveness between highly and low steady to the hypoxia action of flies. Flies of line Conton-S after preadaptation to hypoxia acquired more firmness to the high temperature. Most of flies in line Uman, who are high-steady to the action of hypoxia, had positive phototaksis. It goes to show that firmness to the high temperature and phototaksis flies Drosophila are genetically programmed and passed on an inheritance.
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