Results 141 to 150 of about 6,705 (181)
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2020
Abstract The dominant mode of reproduction in eucaryotes is sexual. This has been described as a paradox given that sex is much more costly than reproducing asexually, such as by parthenogenesis. In the Crustacea, parthenogenesis is commonly found in the Ostracoda and Branchiopoda (Artemia and Cladocera), and studies of these species ...
David J. Innes, France Dufresne
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Abstract The dominant mode of reproduction in eucaryotes is sexual. This has been described as a paradox given that sex is much more costly than reproducing asexually, such as by parthenogenesis. In the Crustacea, parthenogenesis is commonly found in the Ostracoda and Branchiopoda (Artemia and Cladocera), and studies of these species ...
David J. Innes, France Dufresne
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Centrosomes and parthenogenesis
2001Publisher Summary This chapter describes the parthenogenetic assay and reviews the results concerning the capacity of centrosomes isolated from different cell types in different species to induce frog egg cleavage. The chapter discusses the potential of current in vitro systems to identify important molecular events of the pathway and also ...
F, Tournier, M, Bornens
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Nature, 1973
In vitro treatment of mouse eggs with hyaluronidase can activate them to develop parthenogenetically as well as denuding them of cumulus cells1–4. Activation and subsequent behaviour of the eggs depend on certain defined conditions. Szollosi5 observed morphological changes in unfertilized mouse eggs in vivo after approximately 14 h in the oviduct ...
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In vitro treatment of mouse eggs with hyaluronidase can activate them to develop parthenogenetically as well as denuding them of cumulus cells1–4. Activation and subsequent behaviour of the eggs depend on certain defined conditions. Szollosi5 observed morphological changes in unfertilized mouse eggs in vivo after approximately 14 h in the oviduct ...
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Current Biology
Ellie Smith and David Shuker introduce facultative parthenogenesis, the ability of organisms to alternate between sexual and asexual reproduction.
Ellie B W, Smith, David M, Shuker
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Ellie Smith and David Shuker introduce facultative parthenogenesis, the ability of organisms to alternate between sexual and asexual reproduction.
Ellie B W, Smith, David M, Shuker
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Parthenogenesis and developmental constraints
Evolution & Development, 2019AbstractThe absence of a paternal contribution in an unfertilized ovum presents two developmental constraints against the evolution of parthenogenesis. We discuss the constraint caused by the absence of a centrosome and the one caused by the missing set of chromosomes and how they have been broken in specific taxa.
Frietson Galis, Jacques J. M. van Alphen
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Parthenogenesis in Komodo dragons
Nature, 2006Parthenogenesis, the production of offspring without fertilization by a male, is rare in vertebrate species, which usually reproduce after fusion of male and female gametes. Here we use genetic fingerprinting to identify parthenogenetic offspring produced by two female Komodo dragons (Varanus komodoensis) that had been kept at separate institutions and
Watts PC +5 more
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The advantages of hermaphroditism and parthenogenesis
Journal of Theoretical Biology, 1966Abstract Poisson data on the probability of successful fertilization contact by gonochoristic, hermaphroditic, and parthenogenetic species indicate that the latter sexual types have an increasing advantage as populations become sparse, when the populations are thinly scattered in temporary or marginal habitats, and when the effective breeding area is
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Parthenogenesis in an elasmobranch in the presence of conspecific males
Journal of Fish Biology, 2023Kevin Feldheim
exaly
Parthenogenesis in dipterans: a genetic perspective
Proceedings of the Royal Society B: Biological Sciences, 2023Alexis L Sperling, David M Glover
exaly