Dictionary » C » Chromatids



noun, singular: chromatid

The two strands joined together by a single centromere, formed from the duplication of the chromosome during the early stages of cell division and then separate to become individual chromosomes during the late stages of cell division.


The term chromatid was proposed by Clarence Erwin McClung (1900) for each of the four threads making up a chromosome-pair during meiosis. It was later used also for mitosis.

Chromatids may be sister or non-sister chromatids.

When chromatids separate and move toward opposite poles of the cell, they are now referred to as daughter chromosomes.

Word origin: Greek khrōma, khrōmat-, color.

Related terms: sister chromatids, non-sister chromatid.

Compare: homologous chromosomes.
See also: centromere, meiosis, mitosis.

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Re: Chromatin

... chromosomal centromeres, there are 46 centromeres total. After replication there are still 46 centromeres, but the mass of DNA and number of chromatids have doubled (and so you get the X-shaped chromosomes you typically see in textbook cartoons). At this point you have twice the number of ...

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by jonmoulton
Thu Sep 04, 2014 3:04 pm
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 4221

Need some help with a question

In the cell cycle, at which stages do two chromatids make up one chromosome? (Can be multiple answers) a. beginning of mitosis b. end of G1 phase c. beginning of S (Synthesis) d. end of mitosis e. beginning of G2 phase

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by nillkill
Sat Mar 22, 2014 5:49 pm
Forum: Cell Biology
Topic: Need some help with a question
Replies: 0
Views: 2642

Meiosis prophase I crossover

... due to its size compared to the chromosome mass. BBBBBBBxxBBBBBBBxxBBBBBBBxxBBBBBBBxxBBBBBBB CCCCCCCxxCCCCCCCxxCCCCCCCxxCCCCCCCxxCCCCCCC Where the chromatids overlap, specialist proteins break the segments. There could be other proteins that “hold” the two chromatids in place at the chiasma while ...

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by gs99
Fri Mar 07, 2014 9:23 pm
Forum: Molecular Biology
Topic: Meiosis prophase I crossover
Replies: 0
Views: 4933

Year 11 Meiosis helpp!!!

... up in homologous pairs 'head to toe'. Cell division occurs and 2 daughter cells are produced both diploid cells. From these 2 daughter cells the chromatids are pulled apart and then cell divison occurs once more producing 4 daughter cells (haploid cells) all with different genetic information. ...

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by JenL97
Wed Oct 16, 2013 7:00 am
Forum: Human Biology
Topic: Year 11 Meiosis helpp!!!
Replies: 3
Views: 4463


... with this question. It says Crossing-over involves the exchange of genetic information between which of the following: sex chromosomes, sister chromatids, chromatids, homologues. I chose homologues seeing the answers should be non-sister chromatids but research suggests homologous chromosomes. ...

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by myst
Sat Aug 24, 2013 3:12 pm
Forum: Genetics
Topic: Crossing-over
Replies: 0
Views: 2652
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