germ plasm

germ plasm
Chromatin Chro"ma*tin, n. (Biol.) The deeply staining substance of the nucleus and chromosomes of eukaryotic cells, composed of DNA and basic proteins (such as histones), the DNA of which comprises the predominant physical basis of inheritance. It was, at the beginning of the 20th century, supposed to be the same substance as was then termed {idioplasm} or {germ plasm}. In most eukaryotic cells, there is also DNA in certain plasmids, such as mitochondria, or (in plant cells) chloroplasts; but with the exception of these cytoplasmic genetic factors, the nuclear DNA of the chromatin is believed to contain all the genetic information required to code for the development of an adult organism. In the interphase nucleus the chromosomes are dispersed, but during cell division or meiosis they are condensed into the individually recognizable chromosomes. The set of chromosomes, or a photographic representation of the full set of chromosomes of a cell (often ordered for presentation) is called a karyotype. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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  • Germ plasm — or polar plasm is a zone found in the cytoplasm of the egg cells of some model organisms (such as Caenorhabditis elegans , Drosophila melanogaster , Xenopus laevis ), which contains determinants that will give rise to the germ cell lineage. As… …   Wikipedia

  • Germ plasm — (Biol.) See {Plasmogen}, and {Idioplasm}. [1913 Webster] …   The Collaborative International Dictionary of English

  • germ plasm — n 1) germ cells and their precursors serving as the bearers of heredity and being fundamentally independent of other cells 2) the hereditary material of the germ cells: GENES * * * the substance postulated by 19th century biologists (notably… …   Medical dictionary

  • germ plasm — germ plasm. См. зародышевая плазма. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • germ plasm — germ′ plasm n. gen the substance of reproductive cells that contains chromosomes • Etymology: 1885–90 …   From formal English to slang

  • germ plasm — n. the reproductive cells of an organism, particularly that portion of the reproductive cells involved in heredity: cf. SOMATOPLASM …   English World dictionary

  • germ plasm — noun the protoplasm of the germ cells that contains chromosomes and genes • Syn: ↑plasm • Hypernyms: ↑protoplasm, ↑living substance * * * noun 1. : germ cells and their precursors regarded as bearers of hereditary characters and as at all times… …   Useful english dictionary

  • germ plasm — gyvulių (paukščių) genofondas statusas Aprobuotas sritis veislininkystė apibrėžtis Vienos žemės ūkio gyvulių (paukščių) rūšies populiacijos palyginti pastovi veislių visuma tam tikru laiku. atitikmenys: angl. gene pool; germ plasm vok. Genetische …   Lithuanian dictionary (lietuvių žodynas)

  • germ plasm — gemalinė plazma statusas T sritis augalininkystė apibrėžtis Paveldimumo medžiaga, susitelkusi ląstelių branduoliuose ir perduodama gemalinių ląstelių kitoms kartoms. atitikmenys: angl. germ plasm; idioplasm rus. зародышевая плазма; идиоплазма… …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • germ-plasm theory — Concept of the physical basis of heredity expressed by the biologist August Weismann (1834–1914). It claimed that germ plasm, which Weismann believed to be independent from all other cells of the body, was the essential element of germ cells… …   Universalium

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