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Three types of cell reproduction are compared: the relatively simple Binary fission and two more complicated types that either involve mitosis or meiosis.

Binary fission. Organisms such as bacteria typically have a single chromosome (green). At the start of the binary fission process, the DNA molecule of the cell's chromosome is replicated, producing two copies of the chromosome. A key aspect of bacterial cell reproduction is making sure that each daughter cell gets a copy of the chromosome. Cytokinesis is the actual physical separation of the two new daughter cells.

Cell reproduction that involves mitosis. Most eukaryotic organisms like humans have more than one chromosome. In order to make sure that a copy of each chromosome gets segregated into each daughter cell, the spindle apparatus is used (blue threads). The chromosomes are moved along the long thin microtubules like trains moving along train tracks. Humans are diploid; we have two copies of each type of chromosome, one from the father (red) and one from the mother (green).

Cell reproduction that involves meiosis. The human sex cells (gametes) are produced by meiosis. For sperm production there are two cytokinesis steps that produce a total of four cells, each with half the normal number of chromosomes. The situation is different in the ovaries for egg production where one of the four sets of chromosomes that is segregated is placed in a large egg cell, ready to be combined with the DNA from a sperm cell (see meiosis for details).

This image was created for the cell growth article.

Source: I made this diagram with ClarisDraw and PhotoShop.

Note: a GFDL license for use of this image was automatically granted when I uploaded the image to Wikipedia. Since User:Bevo requested an explicit copyright status statement and since the Wikipedia:Image description page article suggests that "Adding explicit copyright information helps", I am providing one:

The copyright to this image is retained by John Schmidt (JWSchmidt).

The Wikipedia:Image description page also suggests including an explicit statement about the GFDL license, so:

Permission is granted to copy, distribute and/or modify this image under the terms of the Wikipedia GFDL, as indicated in the fine print at the bottom of this page. JWSchmidt 15:11, 11 Apr 2004 (UTC)

Source: English Wikipedia, original upload see file history

Tugtar cead an doiciméad seo a chóipeáil, a dháileadh agus/nó a mhodhnú faoi théarmaí an Ceadúnas Doiciméadúcháin Saor ó GNU, Leagan 1.2 nó aon leagan níos déanaí a d’fhoilsigh an Fondúireacht Bogearraí Saor in Aisce; gan aon Rannóga Inmheánacha, gan aon Téacsanna Clúdaigh Tosaigh, agus gan aon Téacsanna Clúdaigh Cúil. Tá cóip den cheadúnas san áireamh sa chuid dar teideal Ceadúnas Doiciméadúcháin Saor ó GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	Is féidir: an saothar seo a roinnt – an saothar seo a chóipeáil, a dháil amach, agus a tharchur an saothar seo a athmheascadh – an saothar seo a oiriúnú Ach amháin má leantar na coinníollacha seo a leanas: sannadh – Ní mor creidiúint a thabhairt leis an saothar, faoi mar a shonraigh an údar nó tabharthóir an ceadúnais (ach ná húsáid modh a thugann le fios go thacaíonn sé/sí tú féin nó an úsáid a bhaineann tú as an saothar). comhroinn araon – Má athraíonn tú nó síneann tú amach an saothar seo, ní féidir é a dháileadh ach amhaín faoin gceadúnas céanna nó ceann cosúil leis an gceann seo.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

File history English Wikipedia

(del) (cur) 21:51, 6 July 2004 . . Guanaco (174122 bytes) (transparency, crop, optimize)
(del) (rev) 05:21, 31 March 2004 . . JWSchmidt (176449 bytes)
(del) (rev) 04:21, 31 March 2004 . . JWSchmidt (176121 bytes)
(del) (rev) 03:54, 31 March 2004 . . JWSchmidt (172333 bytes) (Three types of cell growth are compared.)

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