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Hybridogenesis In Water Frogs
The fertile hybrids of European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis ( hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental species (containing a genome not recombined with the genome of the first parental species). The first parental genome is restored by fertilization of these gametes with gametes from the first species (sexual host). In all-hybrid populations of the edible frog ''Pelophylax'' kl. ''esculentus'', however, triploid hybrids provide this missing genome. Because half of the genome is transmitted to the next generation clonally (not excluded unrecombined intact genome), and only the other half sexually (recombined genome of the sexual host), the hybridogenesis is a hemiclonal mode of reproduction. For example, the edible frog ''Pelophylax'' kl. ''esculentus'' (mostly RL genome), which is a hybridogenetic hybrid of the marsh frog ''P. ridibund ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Frog (Pelophylax Esculentus Complex) Danube Delta
Green frog may refer to various frogs worldwide: * ''Pelophylax'', a true frog genus in the family Ranidae found in the Old World ** Specifically, the edible frog (''P. ''kl.'' esculenta''), the most common ''Pelophylax'' of Europe * ''Lithobates clamitans'', a true frog species in the family Ranidae of North America that also includes the subspecies bronze frog * ''Litoria aurea'', a Hylidae ("true tree frog") species of Australia, also known as green and golden bell frog, green bell frog or green and golden swamp frog * '' Green Frog Hybrid Bus'', a bus company in the Philippines that consists of the country's first hybrid electric buses in their fleet See also *Green Toad (other) Green toad can refer to multiple species of toad, all formerly included in the genus ''Bufo'': *''Anaxyrus debilis'', the North American green toad, from Mexico and the United States *'' Anaxyrus retiformis'', the Sonoran green toad, from Mexico an ... {{disambiguation Animal common name dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marsh Frog
The marsh frog (''Pelophylax ridibundus'') is a species of water frog native to Europe and parts of western Asia. Description The marsh frog is the largest type of frog in most of its range, with males growing to a size around 100 mm (3.9 in) SVL and females slightly larger (4 in) SVL. There is a large variation in colour and pattern, ranging from dark green to brown or grey, sometimes with some lighter green lines; a lighter line on the back is generally present. The frog will usually be darker coloured in early spring to absorb heat more efficiently. Tadpoles can reach up to 190 mm (7.3 in) in length, but this usually occurs in places with long winters where the tadpole has time to grow. Distribution and habitat They occur in a large part of Europe starting from western France and spreading out into the Middle East and about a quarter into Russia. There are also isolated populations in Saudi Arabia and the Russian Far East, along with some introduced populations in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chromosomal Crossover
Chromosomal crossover, or crossing over, is the exchange of genetic material during sexual reproduction between two homologous chromosomes' non-sister chromatids that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs in the ''pachytene'' stage of prophase I of meiosis during a process called synapsis. Synapsis begins before the synaptonemal complex develops and is not completed until near the end of prophase I. Crossover usually occurs when matching regions on matching chromosomes break and then reconnect to the other chromosome. Crossing over was described, in theory, by Thomas Hunt Morgan. He relied on the discovery of Frans Alfons Janssens who described the phenomenon in 1909 and had called it "chiasmatypie". The term '' chiasma'' is linked, if not identical, to chromosomal crossover. Morgan immediately saw the great importance of Janssens' cytological interpretation of chiasmata to the experimental results of hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybridogenesis
Parthenogenesis (; from the Greek grc, παρθένος, translit=parthénos, lit=virgin, label=none + grc, γένεσις, translit=génesis, lit=creation, label=none) is a natural form of asexual reproduction in which growth and development of embryos occur in a gamete (egg or sperm) without combining with another gamete (e.g., egg and sperm fusing). In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants, parthenogenesis is a component process of apomixis. In algae, parthenogenesis can mean the development of an embryo from either an individual sperm or an individual egg. Parthenogenesis occurs naturally in some plants, algae, invertebrate animal species (including nematodes, some tardigrades, water fleas, some scorpions, aphids, some mites, some bees, some Phasmatodea and parasitic wasps) and a few vertebrates (such as some fish, amphibians, reptiles and birds). This type of reproduction has been induced artificially in a few sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Italian Pool Frog
The Italian pool frog (''Pelophylax bergeri'') is a species of frog in the family Ranidae. Found on the mainland of Italy and the Mediterranean islands of Sicily, Elba, Corsica and Sardinia, its natural habitats are rivers, swamps, freshwater lakes and freshwater marshes. It is not considered threatened by the IUCN. Description The Italian pool frog grows to a snout-to-vent length of about and has a pointed snout and triangular-shaped head. The tongue is notched and it has vomerine teeth in the roof of its mouth. The skin is smooth and not warty. The colour is variable and depends on the animal's location, but is usually some shade of green with black spots, but may be reddish-brown or grey. There is a pale stripe running along the centre of the back. The underparts are greyish-white marked with dark blotches and the hind legs have dark stripes. Males have a pair of external vocal sacs on either side of the mouth which are only visible when the animal is calling. The voice is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Italian Edible Frog
The Italian edible frog (''Pelophylax'' kl. ''hispanicus'') is a hybridogenic species in the true frog family Ranidae. These frogs are the offspring of '' P. bergeri'' and either '' P. ridibundus'' or the edible frog (''P.'' kl. '' esculentus'') which is itself of hybrid origin. It is endemic to Italy; despite the specific name ''hispanicus'' (Latin for "the Spanish one"), it does not occur in Spain. Its natural habitats are rivers, intermittent rivers, swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, and intermittent freshwater marshes. It is not considered threatened by the IUCN. See also * Hybridogenesis in water frogs The fertile hybrids of European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis ( hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental ... References :* Andreone, F. 2004.Pelophylax hispanicus 2006 IUCN Red List ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perez's Frog
The Perez's frog, also known as Iberian waterfrog, Iberian green frog, or Coruna frog (''Pelophylax perezi'') is a species of frog in the family Ranidae. It is native to southern France, Portugal, Spain, and has been introduced to the Canary and Balearic Islands, Madeira, the United Kingdom, and the Azores. In the Iberian Peninsula it is widespread and common. Its natural habitats are temperate forests, temperate shrubland, Mediterranean-type shrubby vegetation, rivers, intermittent rivers, swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, intermittent freshwater marshes, sandy shores, arable land, and urban areas. It is not considered threatened by the IUCN. See also * Hybridogenesis in water frogs The fertile hybrids of European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis ( hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graf's Hybrid Frog
Graf's hybrid frog (''Pelophylax'' kl. ''grafi'') is a hybridogenic species in the true frog family Ranidae. It is found in France and Spain. Its natural habitats are rivers, intermittent rivers, swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, intermittent freshwater marshes, arable land, pastureland, and heavily degraded former forest. It is becoming rare due to habitat loss. See also * Hybridogenesis in water frogs The fertile hybrids of European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis ( hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental ... References Amphibians of Europe grafi Amphibia hybrids Amphibians described in 1995 Taxonomy articles created by Polbot {{Ranidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia and it is located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. Comprising the westernmost peninsulas of Eurasia, it shares the continental landmass of Afro-Eurasia with both Africa and Asia. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south and Asia to the east. Europe is commonly considered to be Boundaries between the continents of Earth#Asia and Europe, separated from Asia by the drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea and the waterways of the Turkish Straits. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rana Esculenta On Nymphaea Edit
Rana may refer to: Astronomy * Rana (crater), a crater on Mars * Delta Eridani or Rana, a star People, groups and titles * Rana (name), a given name and surname (including a list of people and characters with the name) * Rana (title), a historical title used today as a hereditary name in South Asia * Rana dynasty, a ruling dynasty in Nepal (1846–1951) * Rana, a South Asian ethnicity, subgroup of the Tharu people Places * Rana, Burkina Faso, a town in Boulkiemdé Province, Burkina Faso * Raná (Chrudim District), village in Pardubice Region, Czech Republic * Raná (Louny District), village and municipality in Ústí nad Labem Region, Czech Republic * Rana, Norway, municipality in Nordland County, Norway * Råna, a mountain in Møre og Romsdal County, Norway * Rana Colony, a town in Punjab Province, Pakistan * Ra'na, a former village in Palestine * Rana, a medieval principality on Rügen, Germany Other uses * ''Rana'' (genus), a genus of frogs * Rana (software), a vocal for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klepton
In biology, a klepton (abbr. kl.) and synklepton (abbr sk.) is a species that requires input from another biological taxon (normally from a species which is closely related to the kleptonic species) to complete its reproductive cycle. Specific types of kleptons are ''zygokleptons'', which reproduce by zygogenesis; ''gynokleptons'' which reproduce by gynogenesis, and ''tychokleptons'', which reproduce by a combination of both systems. Kleptogenic reproduction results in three potential outcomes. A unisexual female may simply activate cell division in the egg through the presence of a male's sperm without incorporating any of his genetic material—this results in the production of clonal offspring. The female may also incorporate the male's sperm into her egg, but can do so without excising any of her genetic material. This results in increased ploidy levels that range from triploid to pentaploid in wild individuals. Finally, the female also has the option of replacing some of her ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybridogenesis In Water Frogs
The fertile hybrids of European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis ( hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental species (containing a genome not recombined with the genome of the first parental species). The first parental genome is restored by fertilization of these gametes with gametes from the first species (sexual host). In all-hybrid populations of the edible frog ''Pelophylax'' kl. ''esculentus'', however, triploid hybrids provide this missing genome. Because half of the genome is transmitted to the next generation clonally (not excluded unrecombined intact genome), and only the other half sexually (recombined genome of the sexual host), the hybridogenesis is a hemiclonal mode of reproduction. For example, the edible frog ''Pelophylax'' kl. ''esculentus'' (mostly RL genome), which is a hybridogenetic hybrid of the marsh frog ''P. ridibund ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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