Results 41 to 50 of about 28,232 (129)
First observation of facultative paedomorphosis in the Danube crested newt (Triturus dobrogicus Kiritzescu, 1903) and the occurrence of facultative paedomorphosis in two newt species from soda pans of the Danube-Tisza Interfluve (Kiskunság National Park, Hungary) [PDF]
, 2013 The first observation of paedomorphosis in Triturus dobrogicus and the occurrence of facultative paedomorphosis in two newt species (T.dobrogicus and Lissotriton vulgaris) from soda pans of the Danube- Tisza Interfluve, Hungary are reported in this ...
Cozma, Nastasia Julianna +2 more
core +2 more sources
Bio-Protocol, 2015 Seeds derived from a diploid, sexual plant typically contain a 2n embryo (n+n) and 3n endosperm, a ratio characteristic for most flowering plants. However, this ratio is altered in apomictic species, which reproduce asexually through seeds (Koltunow and ...
Christian Sailer +2 more
doaj +1 more source
Ecology and Evolution, 2018 Naturally occurring population variation in reproductive mode presents an opportunity for researchers to test hypotheses regarding the evolution of sex.
Mercedes Burns +2 more
doaj +1 more source
Ecology and Evolution, 2020 The maintenance of sexuality is a puzzling phenomenon in evolutionary biology. Many universal hypotheses have been proposed to explain the prevalence of sex despite its costs, but it has been hypothesized that sex could be also retained by lineage ...
Sebastián I. Martel +4 more
doaj +1 more source
Data from: Facultative parthenogenesis in a critically endangered wild vertebrate
, 2015 Facultative parthenogenesis — the ability of sexually reproducing species to sometimes produce offspring asexually — is known from a wide range of ordinarily sexually reproducing vertebrates in captivity, including some birds, reptiles and sharks 1, 2 ...
Fields, Andrew T. +3 more
core +1 more source
Apospory appears to accelerate onset of meiosis and sexual embryo sac formation in sorghum ovules
BMC Plant Biology, 2011 Background Genetically unreduced (2n) embryo sacs (ES) form in ovules of gametophytic apomicts, the 2n eggs of which develop into embryos parthenogenetically. In many apomicts, 2n ES form precociously during ovule development.
Elliott Estella +4 more
doaj +1 more source
Facultative parthenogenesis in a diamondback water snake (Nerodia rhombifer)
Here we describe a case of facultative parthenogenesis in a diamondback water snake (Nerodia rhombifer). An adult female N. rhombifer kept in captivity produced four unfertilized ova, one stillborn and one live neonate in July 2016.
Gasanov E.V., Katz A.V.
core +1 more source
Frontiers in Plant Science, 2019 Aposporous apomictic plants form clonal maternal seeds by inducing the emergence of non-reduced (2n) embryo sacs in the ovule nucellus and the development of embryos by parthenogenesis.
Carolina Colono +9 more
doaj +1 more source
Temperature, age of mating and starvation determine the role of maternal effects on sex allocation in the mealybug Planococcus citri [PDF]
, 2010 Environmental effects on sex allocation are common, yet the evolutionary significance of these effects remains poorly understood. Environmental effects might influence parents, such that their condition directly influences sex allocation by altering the ...
Shuker, David M., +11 more
core +2 more sources