Babylon 10
Simply the best definition!

Download it's free

Polyploid

Wikipedia English The Free Encyclopedia

Download this dictionary
Polyploid
Polyploid cells and organisms are those containing more than two paired (homologous) sets of chromosomes. Most species whose cells have nuclei (Eukaryotes) are diploid, meaning they have two sets of chromosomes—one set inherited from each parent. However, polyploidy is found in some organisms and is especially common in plants. In addition, polyploidy occurs in some tissues of animals that are otherwise diploid, such as human muscle tissues. This is known as endopolyploidy. Species whose cells do not have nuclei, that is, Prokaryotes, may be polyploid organisms, as seen in the large bacterium Epulopiscium fishelsoni [1] Hence ploidy is defined with respect to a cell. Most eukaryotes have diploid somatic cells, but produce haploid gametes (eggs and sperm) by meiosis. A monoploid has only one set of chromosomes, and the term is usually only applied to cells or organisms that are normally diploid. Male bees and other Hymenoptera, for example, are monoploid. Unlike animals, plants and multicellular algae have life cycles with two alternating multicellular generations. The gametophyte generation is haploid, and produces gametes by mitosis, the sporophyte generation is diploid and produces spores by meiosis.

See more at Wikipedia.org...


© This article uses material from Wikipedia® and is licensed under the GNU Free Documentation License and under the Creative Commons Attribution-ShareAlike License

Wikipedia Deutsch Die freie Enzyklopädie

Download this dictionary
Polyploidie
Als Polyploidie bezeichnet man in der Biologie das bei manchen Arten zu beobachtende Phänomen, mehr als zwei Sätze von Chromosomen in den Zellen zu besitzen. Bei einigen weiteren Arten tritt Polyploidie nur in einzelnen Zellen auf.

Mehr unter Wikipedia.org...


© Dieser Eintrag beinhaltet Material aus Wikipedia® und ist lizensiert auf GNU-Lizenz für freie Dokumentation und Creative Commons Attribution-ShareAlike License

Wikipedia Nederlands De vrije encyclopedie

Download this dictionary
Polyploid
 
Polyploïd
 
Polyploïdie

© Dit artikel maakt gebruik van materiaal uit Wikipedia® en valt onder de GNU-licentie voor vrije documentatie en onder de licentie Creative Commons Naamsvermelding/Gelijk delen

Wikipédia Français

Download this dictionary
Polyploïdie
La polyploïdie est le fait, chez un être vivant, de posséder un patrimoine chromosomique au moins égal au double de la normale (tétraploïdie = 4n), ou triple (hexaploïdie = 6n), voire plus.

Pour la suite, voir Wikipédia.org…


© Cet article se sert du contenu de Wikipédia® et est autorisé sous les termes de la Licence de Documentation libre GNU et est distribué sous les termes de la licence Creative Commons Paternité-Partage des Conditions Initiales à l'Identique 3.0 non transposé.

Polskojezyczna Wikipedia - wolna encyklopedia

Download this dictionary
Polieuploidia
Polieuploidy lub poliploidy – organizmy, u których zostaje zwielokrotniony cały garnitur chromosomów, np. 3n, 4n, 5n. Mutację tę można wywołać sztucznie (np. kolchicyną), blokując rozejście się chromosomów w czasie podziału komórki.

W celu uzyskania więcej informacji, zobacz w Wikipedia.οrg...


© W niniejszym artykule wykorzystano materialy z Wikipédia® i jest na licencji GNU Free Documentation License, a na licencji licencji Commons Attribution-ShareAlike.

| Polyploid in English | Polyploid in French | Polyploid in Italian | Polyploid in Spanish | Polyploid in Dutch | Polyploid in Portuguese | Polyploid in German | Polyploid in Russian | Polyploid in Japanese | Polyploid in Turkish | Polyploid in Hebrew | Polyploid in Arabic | Polyploid in Polish | Polyploid in Czech | Polyploid in Latvian | Polyploid in Catalan | Polyploid in Urdu | Polyploid in Bulgarian | Polyploid in Danish | Polyploid in Norwegian | Polyploid in Swedish | Polyploid in Farsi | Polyploid in Latin