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The natural origin of diploid parthenogenesis in whiptail lizards has been through interspecific hybridization. Genomes of the parthenogens indicate that they originated in one generation, as the lizards clone the F1 hybrid state. In addition, hybridization between diploid parthenogens and males of bisexual species has resulted in triploid parthenogenetic clones in nature. Consequently, the genus Aspidoscelis contains numerous gonochoristic (= bisexual) species and numerous unisexual species whose closest relatives are bisexual, and from whom they originated through instantaneous sympatric speciation and an abrupt and dramatic switch in reproductive biology.

american museum novitates

Laboratory Hybridization Among North American Whiptail Lizards, Including<i>Aspidoscelis Inornata Arizonae × A. tigris marmorata</i>(Squamata: Teiidae), Ancestors of Unisexual Clones in Nature

Laboratory Hybridization Among North American Whiptail Lizards, IncludingAspidoscelis Inornata Arizonae × A. tigris marmorata(Squamata: Teiidae), Ancestors of Unisexual Clones in Nature