Abstract
The non-vitellogenic ovaries from homozygous apterous4 mutants of Drosophila melanogaster synthesise yolk-proteins when cultured in vitro, which accounts for the ability of ap4/ap4 ovaries to become vitellogenic in a male-host environment. However, when ap4/ap4 ovaries are transplanted into D. arizonensis females, a large proportion of the ovarian yolk proteins are of the arizonensis type, indicating that ap4/ap4 ovaries are also able to take up yolk proteins in a suitable female-host environment.
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