Chromomere

Chromomere

A chromomere, also known as an idiomere, is one of the serially aligned beads or granules of an eukaryotic chromosome, resulting from local coiling of a continuous DNA thread.[1] It is visible on a chromosome during the prophase of meiosis and mitosis. Giant banded (Polytene) chromosomes resulting from the replication of the chromosomes and the synapsis of homologs without cell division is a process called endomitosis. These chromosomes consist of more than 1000 copies of the same chromatid that are aligned and produce alternating dark and light bands when stained. The dark bands are the chromomere.

The chromomeres are present during leptotene phase of prophase I during meiosis. During zygotene phase of prophase I, the chromomeres of homologs align with each other to form homologous rough pairing (homology searching). These chromomeres helps provide a unique identity for each homologous pairs.

There are more than 2000 chromomeres on 20 chromosomes of maize.

References

  1. ^ "Chromomere" - The Mosby Medical Encyclopedia

External links



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  • chromomere — chromomere. См. хромомера. (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.

  • chromomere — [krō′mə mir΄] n. [ CHROMO + MERE] any of the granules of chromatin arranged linearly on a chromosome chromomeric [krō′məmer′ik] adj …   English World dictionary

  • chromomere — 1. A condensed segment of a chromonema; densely staining bands visible in chromosomes under certain conditions. 2. SYN: granulomere. [chromo + G. meros, a part] * * * chro·mo·mere krō mə .mi(ə)r n the highly refractile portion of a blood platelet …   Medical dictionary

  • chromomere — chromomera statusas T sritis augalininkystė apibrėžtis Grūdelių pavidalo chromatino telkinys, išsidėstęs išilgai chromonemos. atitikmenys: angl. chromomere rus. хромомер …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • chromomere — noun Etymology: International Scientific Vocabulary Date: 1896 one of the small bead shaped and heavily staining masses of coiled chromatin that are linearly arranged along the chromosome • chromomeric adjective …   New Collegiate Dictionary

  • chromomere — n. [Gr. chroma, color; meros, part] One of the bead like concentrations of chromatin found along the length of a chromosome …   Dictionary of invertebrate zoology

  • chromomere — Granular region of condensed chromatin. Used of chromosomes at leptotene and zygotene stages of meiosis, of the condensed regions at the base of loops on lampbrush chromosomes, and of condensed bands in polytene chromosomes of Diptera …   Dictionary of molecular biology

  • chromomere — chromomeric /kroh meuh mer ik, mear /, adj. /kroh meuh mear /, n. 1. Genetics. one of the beadlike granules arranged in a linear series in a chromonema. 2. Anat. the central, granular part of a blood platelet. Cf. hyalomere. [1895 1900; CHROMO +… …   Universalium

  • chromomere — noun Any of a group of beadlike granules of chromatin that constitutes a chromosome during cell division …   Wiktionary

  • chromomere — chro·mo·mere …   English syllables

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