Gynogenesis is a peculiar mode of clonal reproduction in which eggs need to be pseudo-fertilized by sperm, but the male genes are not passed on to the offspring. One mating system in which gynogenesis is found involves a unisexual hybrid, the Amazon molly (Poecilia formosa), which typically uses males of its two parental species as sperm donors. Most gynogenetic lineages do not sexually parasit...

Abstract Background The greenhouse whitefly, Trialeurodes vaporariorum Westwood (Hemiptera: Aleyrodidae) constitutes key pests of greenhouses and field crops, which have developed pesticide resistance over the years. It has emerged as a difficult pest to manage owing its indiscriminate exposure higher dosages insecticides. use natural enemies is environmentally safe alternative management tacti...

INT~ODUCTION ................................................................... Hypothesis of heterogametism ..................................................... Equivalence, within strain C, of pollen of Oenothera pratincola f. typica and mut. latifolia. . The Fa and F, generations of the cross mut. formosa from strain E X mut. latifolia from strainc ............................................