chromatid

See also: Chromatid

English
WOTD – 18 August 2006
In this schematic diagram of a human metaphase chromosome, (1) refers to a chromatid: one-half of the two identical double helices of the already replicated chromosome, both joined together by the centromere (2). During cell division, the identical copies (together called a sister chromatid pair) are divided over the two daughter cells, each double helix then constituting a chromosome in its own right. The short (3) and long arm (4) of the chromatid to the right are also marked.

Etymology

From Ancient Greek χρῶμα (khrôma, “color”) +‎ -id.

Pronunciation
  • IPA(key): /ˈkɹəʊmətɪd/
  • Audio (US)(file)

Noun

chromatid (plural chromatids)

  1. (genetics) After DNA replication, either of the two connected double-helix strands of a metaphase chromosome that separate during mitosis.

Derived terms

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