pachytene

The stage of prophase in meiosis in which pairing of homologous chromosomes is complete and the paired homologues may twine about each other as they continue to shorten; longitudinal cleavage occurs in each chromosome to form two sister chromatids so that each homologous chromosome pair becomes a set of four intertwined chromatids. SYN: pachynema. [pachy- + G. tainia, band, tape]

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pachy·tene 'pak-i-.tēn n the stage of meiotic prophase which immediately follows the zygotene and in which the paired chromosomes are thickened and visibly divided into chromatids
pachytene adj

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n.
the third stage of the first prophase of meiosis, in which crossing over begins.

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pachy·tene (pakґe-tēn) [Gr. pachytēs thickness] the third stage of prophase in meiosis I, during which synapsis is complete, forming pairs of homologous chromosomes known as bivalents, and genetic material may be exhanged by crossing over.

Medical dictionary. 2011.

Look at other dictionaries:

  • pachytène — ● pachytène adjectif Stade pachytène, le troisième stade de la prophase de la première mitose réductionnelle, caractérisé par le raccourcissement et l épaississement des chromosomes. ● pachytène (expressions) adjectif Stade pachytène, le… …   Encyclopédie Universelle

  • pachytene — n. (Biol.) The third stage of the prophase of meiosis, the stage in which the pairing of homologous chromosomes has been completed. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • pachytene — pachytene. См. стадия толстых нитей. (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.

  • pachytene — noun Etymology: International Scientific Vocabulary pachy (from Greek pachys) + tene Date: 1912 the stage of meiotic prophase that immediately follows the zygotene and that is characterized by paired chromosomes thickened and visibly divided into …   New Collegiate Dictionary

  • pachytene — /pak i teen/, n. Cell Biol. the third stage of prophase in meiosis, during which each chromosome pair separates into sister chromatids with some breakage and crossing over of genes. Also, pachynema /pak euh nee meuh/. [ < F pachytène (1900),… …   Universalium

  • pachytene — pach•y•tene [[t]ˈpæk ɪ tin[/t]] n. gen cbl the third stage of prophase in meiosis, during which each chromosome pair separates into sister chromatids with some breakage and crossing over of genes • Etymology: < F pachytène (1900) = Gk pachý(s) …   From formal English to slang

  • pachytene — pachinema statusas T sritis augalininkystė apibrėžtis Mejozės pirmos profazės stadija, kurios metu poromis susijungusios homologinės chromosomos toliau trumpėja ir storėja. atitikmenys: angl. pachynema; pachytene rus. пахинема; пахитена ryšiai:… …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • pachytene — n. [Gr. pachys, thick; tainia, ribbon] A prophase I stage in meiosis in which the chromosomes are thickened and paired and crossing over occurs; see pachynema …   Dictionary of invertebrate zoology

  • pachytene — Classical term for the third stage of prophase I of meiosis, during which the homologous chromosomes are closely paired and crossing over takes place …   Dictionary of molecular biology

  • pachytene — noun The third prophase of meiosis, during which the chromosomes shorten and divide into four chromatids …   Wiktionary

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