Chromosomal components:

(1) Chromatid
(2) Centromere
(3) Short arm
(4) Long arm

A chromatid is one of the two identical copies of DNA making up a duplicated chromosome, which are joined at their centromeres, for the process of cell division (mitosis or meiosis). They are called sister chromatids so long as they are joined by the centromeres. When they separate (during anaphase of mitosis and anaphase 2 of meiosis), the strands are called daughter chromosomes.

In other words, a chromatid is "one-half of a replicated chromosome".[1] It should not be confused with the ploidy of an organism, which is the number of homologous versions of a chromosome.


A dyad is a pair of sister chromatids. This occurs in prophase I of meiosis. After DNA replication, the two sister chromatids align side-by-side and appear to have an undivided centromere, in contrast to mitosis, in which each chromatid appears to have its own separate centromere.

The term dyad can also be used to describe protein morphology.[2]


  1. ^ Chromatid - A Cell Biology Definition
  2. ^ dyad - 4 dictionary results

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Look at other dictionaries:

  • chromatid — n. (Cell Biol.) one of two identical strands into which a chromosome splits during mitosis. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • chromatid — chromatid. См. полухромосома. (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.

  • chromatid — [krō′mə tid΄] n. any of the structures into which a chromosome divides during mitosis or meiosis …   English World dictionary

  • Chromatid — Schematische Darstellung eines Metaphase Chromosoms. Es besteht aus zwei Chromatiden (das rechte mit (1) bezeichnet), die am Centromer (2) zusammenhängen. Der kurze (3) und lange Arm (4) des rechten Chromatids ist ebenfalls gekennzeichnet. Der… …   Deutsch Wikipedia

  • chromatid — chromatidė statusas T sritis augalininkystė apibrėžtis Viena iš dviejų funkcinių chromosomos dalių, gerai matomų profazės ir metafazės metu, o anafazės stadijoje tampančių savarankiškomis chromosomomis. atitikmenys: angl. chromatid rus. хроматида …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • chromatid — noun Date: 1900 one of the usually paired and parallel strands of a duplicated chromosome joined by a single centromere …   New Collegiate Dictionary

  • chromatid — n. [Gr. chroma, color] One of two spiral filaments that make up a chromosome, and separate in cell division, each going to a different pole of the dividing cell and each becoming a daughter chromosome at anaphase in mitosis …   Dictionary of invertebrate zoology

  • chromatid — Single chromosome containing only one DNA duplex. Two daughter chromatids become visible at mitotic metaphase, though they are present throughout G2 …   Dictionary of molecular biology

  • chromatid — /kroh meuh tid/, n. Genetics. one of two identical chromosomal strands into which a chromosome splits longitudinally preparatory to cell division. [1895 1900; CHROMAT + ID3] * * * …   Universalium

  • chromatid — noun Either of the two strands of a chromosome that separate during mitosis …   Wiktionary

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