Results 81 to 90 of about 127 (101)
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Mechanism of facultative parthenogenesis in the ant Platythyrea punctata
Evolutionary Ecology, 2010Thelytokous parthenogenesis, the production of diploid female offspring from unfertilized eggs, can be caused by several cytological mechanisms, which have a different impact on the genetic variation on the offspring. The ponerine ant Platythyrea punctata is widely distributed throughout the Caribbean Islands and Central America and exhibits ...
Katrin Kellner, Jürgen Heinze
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Facultative Parthenogenesis in Vertebrates: Reproductive Error or Chance?
Sexual Development, 2008Parthenogenesis, the development of an embryo from a female gamete without any contribution of a male gamete, is very rare in vertebrates. Parthenogenetically reproducing species have, so far, only been found in the Squamate reptiles (lizards and snakes).
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Can facultative parthenogenesis occur in biparental mealybug species?
Phytoparasitica, 2009The existence of facultative parthenogenesis in mealybugs has been reported by different authors and questioned by others in relation to certain species. We tested the hypothesis of facultative parthenogenesis in relation to three mealybug species, Planococcus citri (Risso), Pseudococcus calceolariae (Maskell) and Pseudococcus viburni (Signoret).
Elsa Borges da Silva +2 more
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Haploid facultative parthenogenesis in sunflower sexual reproduction
NatureFlowering plant sexual reproduction requires double fertilization, yielding embryo and endosperm seed compartments: the latter supports embryo growth and seed germination. In an experiment to generate haploid embryos through inhibition of pollen phospholipase activity in sunflower (Helianthus annus), we serendipitously discovered that emasculated ...
Jian Lv +23 more
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Facultative parthenogenesis and sex-ratio evolution
Evolutionary Ecology, 1987Phenotypic models of selection are used to determine the effect of facultative parthenogenesis on the production of males in a spatially variable environment when (i) sex determination is under strict genetic control, and (ii) when sex may be environmentally determined.
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Zeitschrift für Induktive Abstammungs- und Vererbungslehre, 1917
In the discussion about the relation of parthenogenesis and sex, revived after the discovery of the sex-chromosomes, cases of facultative parthenogenesis in normally bisexual animals play a rather doubtful part. As the great majority of such reports belongs to the older and oldest literature, modern writers appear sceptical in regard to their ...
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In the discussion about the relation of parthenogenesis and sex, revived after the discovery of the sex-chromosomes, cases of facultative parthenogenesis in normally bisexual animals play a rather doubtful part. As the great majority of such reports belongs to the older and oldest literature, modern writers appear sceptical in regard to their ...
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Journal of Insect Physiology, 2017
Facultative parthenogenetic species, in which females can alternate between sex and parthenogenesis, are useful models to investigate the costs and benefits of sex and parthenogenesis, an ongoing issue in biology. The necessary empirical studies comparing the outcomes of alternative reproductive modes on life history traits are rare and focus mainly on
Yasaman, Alavi +2 more
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Facultative parthenogenetic species, in which females can alternate between sex and parthenogenesis, are useful models to investigate the costs and benefits of sex and parthenogenesis, an ongoing issue in biology. The necessary empirical studies comparing the outcomes of alternative reproductive modes on life history traits are rare and focus mainly on
Yasaman, Alavi +2 more
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An Independent Observation of Facultative Parthenogenesis in the Copperhead (Agkistrodon contortrix)
Journal of Herpetology, 2015Abstract Among reptiles, reproduction in the absence of males is often assumed to result from long-term sperm storage. Through the application of molecular genetic tools, biologists are beginning to recognize that facultative parthenogenesis can also explain such reproductive events in snakes.
Mark A. Jordan +2 more
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Facultative Parthenogenesis in a Zoo‐Held Northern Water Snake, Nerodia sipedon
Zoo BiologyABSTRACTOver the past several decades, facultative parthenogenesis (FP)—the ability of a sexually reproducing species to reproduce asexually—in vertebrates has been removed from the realm of obscurity and placed firmly in a position where it warrants focused scientific attention.
Warren Booth +3 more
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Engineering Drosophila melanogaster into facultative parthenogenesis
Lab Animal, 2023openaire +1 more source