Dictionary » C » Chromatids

Chromatids

Definition

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.


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 chromatids, non-sister chromatid.

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


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Genetics with Mitosis and Meiosis

... during S-phase. So, after S-phase, each chromosome consists of two strands. When the DNA is coiled, the two strands are referred to as sister chromatids. The sister chromatids are what make chromosomes X-shaped. However, a chromosome with only one chromatid will be just a line, not an X. The ...

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by wildfunguy
Sun Feb 03, 2013 11:45 pm
 
Forum: Genetics
Topic: Genetics with Mitosis and Meiosis
Replies: 2
Views: 984

Re: Mitosis and meiosis!

... are aligned at the equatorial line while metaphase in mitosis not. In Anaphase I, the homologous chromosomes are separated while sister chromatids are split at centromere in Anaphase of mitosis. You may get more info about meiosis at http://www.ask4biology.com/cell-biology/meiosis/

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by mavis
Wed Jan 30, 2013 9:00 am
 
Forum: Cell Biology
Topic: Mitosis and meiosis!
Replies: 3
Views: 993

cell structure

... zoology teacher asked that how many dna molecules does a chromatin fibre have and how many chromatin fibres make the chromosome structure with 4 chromatids??? pls help

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by super17
Tue Nov 06, 2012 11:53 am
 
Forum: Cell Biology
Topic: cell structure
Replies: 2
Views: 878

How dominance works at the DNA/RNA/protein

Thank you! I was getting confused between pairs of chromosomes and pairs of chromatids. I think I have a clearer mental model now: Suppose we have a gene G which comes in two forms, G (dominant) and g (recessive), and we have an individual who is Gg (heterozygous ...

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by Cat
Fri Oct 05, 2012 1:15 am
 
Forum: Genetics
Topic: How dominance works at the DNA/RNA/protein
Replies: 10
Views: 2050

How dominance works at the DNA/RNA/protein

Thank you! I was getting confused between pairs of chromosomes and pairs of chromatids. I think I have a clearer mental model now: Suppose we have a gene G which comes in two forms, G (dominant) and g (recessive), and we have an individual who is Gg (heterozygous ...

See entire post
by mhwombat
Thu Oct 04, 2012 6:35 pm
 
Forum: Genetics
Topic: How dominance works at the DNA/RNA/protein
Replies: 10
Views: 2050
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