chromatid

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See also: Chromatid

English[edit]

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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[edit]

from Ancient Greek khrōmat(color) +‎ id

Pronunciation[edit]

Noun[edit]

chromatid ‎(plural chromatids)

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

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