Results 111 to 120 of about 547 (142)
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Die Naturwissenschaften, 2010
Thelytokous parthenogenesis in which diploid females are produced from unfertilized eggs, was recently reported for some ant species. Here, we document thelytokous reproduction by queens in the polygynous species Pyramica membranifera. Queens that emerged in the laboratory were kept with or without workers under laboratory conditions.
Johan Billen +2 more
exaly +3 more sources
Thelytokous parthenogenesis in which diploid females are produced from unfertilized eggs, was recently reported for some ant species. Here, we document thelytokous reproduction by queens in the polygynous species Pyramica membranifera. Queens that emerged in the laboratory were kept with or without workers under laboratory conditions.
Johan Billen +2 more
exaly +3 more sources
Experimental and Applied Acarology, 1991
Based on sex-ratio analysis, thelytokous parthenogenesis is shown to be widespread in the mite taxon Desmonomata (Nothroidea sensu lato), with four of the seven families completely thelytokous and a fifth nearly so. Monthly samples from populations in central New York State, Japan, and Canada, representing 22 species in five families, indicate that sex-
Roy Norton, Norton Roy A
exaly +2 more sources
Based on sex-ratio analysis, thelytokous parthenogenesis is shown to be widespread in the mite taxon Desmonomata (Nothroidea sensu lato), with four of the seven families completely thelytokous and a fifth nearly so. Monthly samples from populations in central New York State, Japan, and Canada, representing 22 species in five families, indicate that sex-
Roy Norton, Norton Roy A
exaly +2 more sources
The frequency of thelytokous parthenogenesis in European-derived Apis mellifera virgin queens [PDF]
Apidologie, 2019 Thelytokous parthenogenesis is the asexual production of female progeny. In the honey bee, Apis mellifera, thelytoky is unknown from mated queens, but can occur in virgin queens that have been induced to lay. We used microsatellite markers to quantify theltyoky in virgin A.
Benjamin P Oldroyd +2 more
exaly +2 more sources
A Single Gene Causes Thelytokous Parthenogenesis, the Defining Feature of the Cape Honeybee Apis mellifera capensis [PDF]
Current Biology, 2020 In honeybees, the ability of workers to produce daughters asexually, i.e., thelytokous parthenogenesis, is restricted to a single subspecies inhabiting the Cape region of South Africa, Apis mellifera capensis. Thelytoky has unleashed new selective pressures and the evolution of traits such as social parasitism, invasiveness, and social cancer ...
Benjamin P Oldroyd +2 more
exaly +3 more sources
Cytological mechanisms of thelytokous parthenogenesis in insects
Genome, 1987The eight female parthenogenetic mechanisms recognized in insects are organized under the broad categories "ploidy restoration" and "ploidy stasis." Each term replaces three imprecise and inappropriate existing names. Of the eight mechanisms, two are given names for the first time, and a table brings together all mechanisms in a new manner that shows ...
Richard Y. Lamb, Robert B. Willey
openaire +1 more source
CYTOLOGICAL ANALYSIS OF THE THELYTOKOUS PARTHENOGENESIS IN THE CAPE HONEYBEE (APIS MELLIFERA CAPENSIS ESCHOLTZ) [PDF]
Apidologie, 1983 Friedrich Ruttner
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A single locus determines thelytokous parthenogenesis of laying honeybee workers (Apis mellifera capensis) [PDF]
Heredity, 2005 The evolution and maintenance of parthenogenetic species are a puzzling issue in evolutionary biology. Although the genetic mechanisms that act to restore diploidy are well studied, the underlying genes that cause the switch from sexual reproduction to parthenogenesis have not been analysed. There are several species that are polymorphic for sexual and
Moritz R F A, Fuchs S, R F A Moritz
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Lack of meiotic recombination in thelytokous parthenogenesis of laying workers of Apis mellifera capensis (the Cape honeybee) [PDF]
Heredity, 1994 Offspring of thelytokous laying workers of Apis mellifera capensis were screened using multilocus DNA fingerprinting with the (GATA)4 oligonucleotide. All screened offspring workers revealed an identical DNA fingerprint pattern, lacking evidence of any meiotic recombination.
Robin Moritz, Moritz Robin F A
exaly +2 more sources
Thelytokous parthenogenesis, male clonality and genetic caste determination in the little fire ant: new evidence and insights from the lab [PDF]
Heredity, 2009 Previous studies indicate that some populations of the little fire ant, Wasmannia auropunctata, display an unusual reproduction system polymorphism. Although some populations have a classical haplodiploid reproduction system, in other populations queens are produced by thelytokous parthenogenesis, males are produced by a male clonality system and ...
Jérôme Orivel, Julien Foucaud
exaly +4 more sources