A chromosome configuration visible in late prophase and metaphase of the first meiotic division, where four chromosomes are linked by chiasmata. Can occur in autotetraploids when four homologous chromosomes pair, or in diploids as a result of heterozygosity for a reciprocal translocation between two non-homologous chromosomes.

Glossary of Biotechnology for Food and Agriculture . 2015.

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  • quadrivalent — quadrivalent, ente [ k(w)adrivalɑ̃, ɑ̃t ] adj. • 1866; de quadri et valent ♦ Chim. Qui a pour valence 4. ⇒ tétravalent. ● quadrivalent, quadrivalente adjectif Synonyme de tétravalent. ● quadrivalent, quadrivalente (synonymes) …   Encyclopédie Universelle

  • Quadrivalent — Quad*riv a*lent, a. [Quadri + L. valens, entis, p. pr. See {Valence}.] (Chem.) Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; said of certain atoms and radicals; thus,… …   The Collaborative International Dictionary of English

  • quadrivalent — quadrivalent. См. тетравалент. (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.

  • quadrivalent — [kwä΄dri vā′lənt; kwä′dri vā΄lənt] adj. TETRAVALENT: see VALENT quadrivalence n. quadrivalency …   English World dictionary

  • quadrivalent — Having the combining power (valency) of four. SYN: tetravalent. * * * quad·ri·va·lent .kwäd rə vā lənt, in sense 2 kwä driv ə lənt adj 1) TETRAVALENT 2) composed of four homologous chromosomes synapsed in meiotic prophase quadrivalent n a… …   Medical dictionary

  • quadrivalent — I. adjective Etymology: International Scientific Vocabulary Date: 1865 1. tetravalent 2. composed of four homologous chromosomes synapsed in meiotic prophase II. noun Date: 1923 a quadrivalent chromosomal group …   New Collegiate Dictionary

  • quadrivalent — tetravalentas statusas T sritis augalininkystė apibrėžtis Keturių homologinių chromosomų grupė. atitikmenys: angl. quadrivalent; tetravalent rus. квадривалент; тетравалент ryšiai: sinonimas – kvadrivalentas …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • quadrivalent — quadrivalence, quadrivalency, n. quadrivalently, adv. /kwod reuh vay leuhnt, kwo driv euh /, adj. Chem. 1. having a valence of four; tetravalent. 2. exhibiting four different valences, as antimony with valences of 5, 4, 3, and 3. [1860 65; QUADRI …   Universalium

  • quadrivalent — adjective Having a valence of four …   Wiktionary

  • quadrivalent — qua|dri|va|lent Mot Agut Adjectiu invariable …   Diccionari Català-Català

  • quadrivalent — [ˌkwɒdrɪ veɪl(ə)nt] adjective Chemistry another term for tetravalent …   English new terms dictionary

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