Cellule Germinale
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Home > Art, Film & Photography > Cellule Germinale: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange
Cellule Germinale: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange

Cellule Germinale: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange


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About the Book

Les achats comprennent une adhsion l'essai gratuite au club de livres de l'diteur, dans lequel vous pouvez choisir parmi plus d'un million d'ouvrages, sans frais. Le livre consiste d'articles Wikipedia sur: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange, Zoospore, Ovogonie. Non illustr. Mises jour gratuites en ligne. Extrait: Un spermatozode est une cellule haplode sexuelle (ou gamte) produite par l'appareil reproducteur m[le de l'espce. Les spermatozodes ont t dcrits pour la premire fois en 1677 par Antoni van Leeuwenhoek. Chez les mammifres, le spermatozode est soit porteur du chromosome Y, soit porteur du chromosome X. Le chromosome est impliqu dans la dtermination sexuelle. L'ovotide libr par l'ovaire, est toujours porteur d'un chromosome X. C'est donc le spermatozode qui dtermine le sexe de l'uf obtenu aprs la fcondation de l'ovule. Chez les oiseaux et quelques autres animaux, la dtermination sexuelle est au contraire le fait de l'ovule. Au moins dans les pays riches occidentaux, le nombre moyen de spermatozode semble en dclin rgulier depuis les annes 1900, avec une acclration depuis les annes 1950, et avec cependant une disparit gographique inexplique; le Danemark (galement fortement touch par le syndrme de dysgnsie testiculaire) serait le pays le plus touch en Europe, alors les Finlandais semblent pargns sauf quand ils vont vivre au Danemark. Chez l'humain, le spermatozode a une tte de 5 m par 3 m qui tourne sur elle-mme le long d'une trajectoire hlicodale. La mobilit est assure par un flagelle d'une longueur de 60 65 m. Lors de l'jaculation, allant de 2 6ml de sperme, on retrouve 50 100 millions de spermatozodes par ml de sperme. Le spermatozode est caractris par un minimum de cytoplasme et l'ADN le plus densment compact connu chez les eucaryotes (plus de six fois plus condens q...http: //booksllc.net/?l=fr


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Product Details
  • ISBN-13: 9781159636159
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Weight: 95 gr
  • ISBN-10: 115963615X
  • Publisher Date: 31 Jul 2010
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Sub Title: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange
  • Width: 229 mm


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Cellule Germinale: Asque, Spermatozode, Gamte, Spore, Ovule, Ovocyte, Conidie, Microspore, Baside, Spermatogonie, Macrospore, Gamtange
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