Drosophila Males Provide a Material Contribution to Offspring Sired by Other Males

In Drosophila mojavensis (Patterson & Crow) the opportunity for cuckoldry is great due to female remating, storage of sperm and the transfer of a material donation from the ejaculate. Using a radioisotope and a genetic marker, it was possible to show that not only do first males provide an ejaculate benefit to progeny sired by subsequent males but that the first male's progeny also receive material from the second male. Key-words: Drosophila, cuckoldry, parental contributions