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Chromatid

Definition

noun, plural: chromatids

Either of 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 chromosome during the late stages of cell division.


Supplement

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 chromatid, non-sister chromatid.

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


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Questions about Biology's term

... the basic material of eukaryotic chromosomes. This can also be used to describe the chromosomal material as a whole inclusive of other proteins. Chromatid: Is a copy of a chromosome present after DNA and chromosome replication. So during metaphase the two halves of a copied chromosome are both ...

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by Jesse2504
Tue Jun 23, 2009 6:25 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 222

Questions about Biology's term

What is the difference between chromatid, chromatin and chromosome? It also state that bivalent is visible under microscope as a 4 part structure called tetrad. Is this means that bivalent is also tetrad? My text book state that homologous ...

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by dorevidadamn
Sun Jun 21, 2009 2:53 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 222

Questions about Biology's term

Can someone tell me the meaning of some biology's terms? The terms are as follow: Chromosome Homologous Chromosome Chromatin Chromatid Bivalent Tetrad But not least tell me the differentiate between them. I hope you can label all of them in picture so that I can understand well. Thanks ...

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by dorevidadamn
Sat Jun 13, 2009 3:34 am
 
Forum: General Discussion
Topic: Questions about Biology's term
Replies: 6
Views: 222

Re: Meiosis = extreme confusion. Please help!

... (46 Chromosomes). Before it enters meiosis, its chromosomes have been duplicates (DNA synthesis), which means that the chromosomes each have 2 chromatids joined together in an "X" shape. After meiosis 1, the homologous chromosomes separate, so that each of the 2 daughter cells have ...

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by Picaq
Sun Apr 12, 2009 9:48 pm
 
Forum: Cell Biology
Topic: Meiosis = extreme confusion. Please help!
Replies: 1
Views: 551

Basic meiosis question

In metaphase I can both of the chromatids of a double chromosome crossover? In textbooks the tetrad complex is always shown laid flat (it looks like XX ) so it makes since that only one chromatid from each double chromosome would be able ...

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by dae
Mon Mar 09, 2009 8:48 pm
 
Forum: Cell Biology
Topic: Basic meiosis question
Replies: 3
Views: 477
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