BEHAVIOR GENETICS OF CHOICE OF OVIPOSITION SITE IN <i>DROSOPHILA MELANOGASTER</i>

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  • II. ANALYSIS OF NATURAL POPULATION

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Two experiments were performed on the choice of oviposition site by using isofemale lines of D. melanogaster isolated from natural populations. Forty isofemale lines from Katsunuma and Sapporo were examined for their oviposition sites; either soft surface of medium or hard surface of paper which was stuck into the medium. Significant difference in the proportion of eggs laid on the paper was detected among lines of both localities. The result of the first experiment indicated that there is a large amount of genetic variation in natural populations of D. melanogaster. In the second experiment the oviposition site of two lines, which hatched from eggs collected on seeds and sacs in squeezed draff of grapes in a winary in Katsunuma, was compared. The line collected from seeds laid significantly larger proportion of eggs on the paper than the line collected from sacs. This result indicates that the flies actually choose the oviposition sites in natural fields according to their genetic variations.

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