The Relation between Gynandromorphism and Mutation in Habrobracon

IN Habrob racon juglandis (Ashmead) gynandromorphism and other types of mosaicism occur as rare phenomena. The previous speaker has dealt with the production from fertilized eggs of males which are biparental and presumably diploid. Although numerous such exceptional biparental males regularly appear there have been found only five exceptional uniparental females developed from unfertilized eggs. The production of these females may be explained by postulating suppression of the second oocyte division with resulting diploid parthenogenesis. (n tetrads in egg divide into n dyads in first polar body and n dyads in egg. The latter separate into 2n monads, each of which divides in the first cleavage.) Three biparental diploid mosaics-one female and one male produced by females with reduced wings crossed to type males