Sexual Isolation in a Parthenogenetic Strain of Drosophila mercatorum

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Abstract
The degree of natural sexual isolation that may accompany newly-arisen systems of theyltokous parthenogentic reproduction in D. mercatorum and to what degree sexual isolation may be enhanced by artificial selection was investigated. Choice mating tests using equal numbers of bisexual and parthenogentic strain females were used to determine sexual isolation. A significant degree of natural sexual isolation occurred in the parthenogenetic strain, apparently the result of drift in a small laboratory population. In similar tests using artificially selected substrains and original unselected parthenogenetic strain females, sexual isolation was further increased by artificial selection in 1 substrain. Sexual isolation in the selected substrain probably has a simple genetic basis involving few gene loci rather than an extensive polygenic basis.

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