Vitellogenin disparity in Phormia regina (Diptera: Calliphoridae)

In Phormia regina , female fat body was stimulated to provide for normal vitellogenesis by hormones from either male or female corpora allata. Male fat body failed to provide that synthetic support even though exposed to female hormones by glandular transplants and intersex parabiosis. The present results, from an in vivo oocyte assay with natural hormone sources, are consistent with earlier data which suggest that a sexual disparity in fat body responsiveness accounts for the disparity in vitellogenin production by the sexes of this species.