Dictionary » M » Mitosis



noun, plural mitoses

The process where a single cell divides resulting in generally two identical cells, each containing the same number of chromosomes and genetic content as that of the original cell.


Prior to this, the genetic material of the original (parent) cell has replicated during the S phase of the cell cycle so that when the cell enters mitosis it undergoes four major phases which culminates in the formation of two identical (daughter) cells:

1st phase: Prophase: formation of paired chromosomes, disappearance of nuclear membrane, appearance of the achromatic spindle, formation of polar bodies

2nd phase: Metaphase: arrangement of chromosomes in the equatorial plane. Chromosomes separate into exactly similar halves.

3rd phase: Anaphase: the two groups of daughter chromosomes separate and move along the fibres of the central spindle, each toward one of the asters, forming the diaster.

4th phase: Telophase: two daughter nuclei are formed, the cytoplasm divides, forming two complete daughter cells.

Originally, the term mitosis refers only to nuclear division unaccompanied by cytokinesis (which is the division of the cytoplasm), as in the case of some cells like certain fungi and in fertilized egg of many insects. As used now, mitosis used interchangeably with cell division.

Word origin: from Greek mitos, warp thread + –OSIS.
Related forms:
mitotic (adjective), mitotically (adverb).
See also:
cell, cell division.

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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: 108


... C1 and C2, M1 and M2, and S1 and S2. No crossing over occurs. a. What combination(s) of chromosomes are possible in daughter cells following mitosis? b. What combination(s) of chromosomes are possible in haploid cells following both divisions of meiosis? (Hint: remember independent assortment)

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by lachatausa
Fri Mar 21, 2014 2:55 am
Forum: Genetics
Topic: genetic
Replies: 0
Views: 96

Re: mitosis and miosis

Wikipedia should be a good source for an explanation.

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by jonmoulton
Wed Feb 12, 2014 4:12 pm
Forum: Cell Biology
Topic: mitosis and miosis
Replies: 1
Views: 515

mitosis and miosis

What is mitosis? What is mieosis? Give their differ in both

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by 5499
Sun Feb 09, 2014 2:41 pm
Forum: Cell Biology
Topic: mitosis and miosis
Replies: 1
Views: 515

Re: Do chromosomses ever get competitive?

... other will result in imbalance. A single chromosome can exist more, as long as it does not affect the other chromosomes or cellular process like mitosis. Rarely is the case as your example. If Y chromosome want to out run a X chromososme sperm, there will be more males and less females. Over ...

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by balamurugan3
Wed Aug 07, 2013 3:04 pm
Forum: Cell Biology
Topic: Do chromosomses ever get competitive?
Replies: 9
Views: 4385
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