Marilyn Houck and Margaret Kidwell proposed that P elements were carried from Drosophila willistoni to Drosophila melanogaster by mites that feed on fruit flies (M. A. Houck et al. 1991. Science 253:1125–1129). What evidence do you think would be required to demonstrate that D. melanogaster acquired P elements in this way? Propose a series of experiments to provide such evidence.

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