chromatidn.
/ˈkrəʊmətɪd/, U.S. /ˈkroʊməˌtɪd/ Biology.
One of the two strands into which a chromosome divides longitudinally during mitosis.
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chromatid1900
sister chromatid1914
1900 C. E. McClung in Kansas Univ. Q. A. IX. 78 The term ‘chromosome’ being..restricted to the units of the division figures, there remains no name for the parts composing these when they are compound, as in tetrads and diads... I should like, therefore, to propose the term ‘chromatid’ for each of these.
1939 E. W. Sinnott & L. C. Dunn Princ. Genetics (ed. 3) vii. 166 During synapsis, or previously, each member of the bivalent pair splits longitudinally into two exactly equal daughter chromosomes or chromatids, so that for a time a tetrad is formed consisting of four chromatids.
1952 M. J. D. White in Bourne Cytol. & Cell Physiol. (ed. 2) v. 203 At metaphase, and even in prophase, chromosomes are visibly divided into two spirally coiled threads or chromatids.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).
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n.1900