Results 51 to 60 of about 949 (172)
Tree of Sex: A database of sexual systems [PDF]
, 2014 The vast majority of eukaryotic organisms reproduce sexually, yet the nature of the sexual system and the mechanism of sex determination often vary remarkably, even among closely related species. Some species of animals and plants change sex across their
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PLoS ONE, 2014 Gymnocladus assamicus is a critically endangered tree species endemic to Northeast India, and shows sexual dimorphism with male and hermaphrodite flowers on separate trees. We studied phenology, reproductive biology and mating system of the species.
Baharul Islam Choudhury +2 more
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Genetic variation for outcrossing among Caenorhabditis elegans isolates [PDF]
, 2006 The evolution of breeding systems results from the existence of genetic variation and selective forces favoring different outcrossing rates. In this study we determine the extent of genetic variation for characters directly related to outcrossing, such ...
Manoel, D, Phillips, PC, Teotónio, H
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The Maintenance of Gynodioecy and Androdioecy in a Metapopulation [PDF]
Evolution, 1997 Males and females are at a selective disadvantage relative to hermaphrodites (cosexuals) in species with a colonizing habit, as only cosexuals are able to establish new colonies on their own. The implications of this disadvantage are assessed by means of a computer model of metapopulation dynamics, in which individual colonies are established through ...
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Incidence, correlates, and origins of dioecy in the Island Flora of New Caledonia [PDF]
, 2014 Premise of research. Because it is an inherently risky sexual system, dioecy is globally rare. Attempts to explain unusually high incidences of dioecy on certain islands have generated a considerable literature on the relationships among dioecy, its ...
Lowry, P. P. +3 more
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Iran supports a great share of biodiversity and floristic endemism for Fritillaria spp. (Liliaceae): A review. [PDF]
, 2017 Iran supports a great share of exotic and/or endemic plant genera and species. The genus Fritillaria (Liliaceae) is a precious part of this botanical richness with 19 species, of which 10 are endemic to the country.
Asgari, Davoud +10 more
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Allard's argument versus Baker's contention for the adaptive significance of selfing in a hermaphroditic fish. [PDF]
, 2012 Fertilization assurance (Baker's contention) and multilocus coadaptation (Allard's argument) are two distinct hypotheses for the adaptive significance of self-fertilization in hermaphroditic taxa, and both scenarios have been invoked to rationalize ...
Avise, John C, Tatarenkov, Andrey
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The Scientific World Journal, 2014 Osmanthus fragrans Lour., an evergreen small tree, has the rare sexual system of androdioecy (coexistence of males and hermaphrodites), once with wide-spread natural distribution in the areas of the South Yangzi river basin.
Shaoqing Hu +4 more
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Plant Diversity, 2017 Although hermaphroditism is common in flowering plants, unisexual flowers occur in many plant taxa, forming various sexual systems. However, the sexual system of some plants is difficult to determine morphologically, given that their sex expression may ...
Yang Niu +4 more
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Gelechiidae Moths Are Capable of Chemically Dissolving the Pollen of Their Host Plants [PDF]
, 2011 Background: Many insects feed on pollen surface lipids and contents accessible through the germination pores. Pollen walls, however, are not broken down because they consist of sporopollenin and are highly resistant to physical and enzymatic damage. Here
Chen, Shi +4 more
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