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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

Gefið er leyfi til að afrita, dreifa og/eða breyta þessu skjali samkvæmt Frjálsa GNU Free Documentation License, útgáfu 1.2 eða nýrri, sem gefið er út af Frjálsu hugbúnaðarstofnuninni með engum breytingum þar á. Afrit af leyfinu er innifalið í kaflanum GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Þessi skrá er með Creative Commons Tilvísun-DeilaEins 3.0 Óstaðfært notkunarleyfi.
	Þér er frjálst: að deila – að afrita, deila og yfirfæra verkið að blanda – að breyta verkinu Undir eftirfarandi skilmálum: tilvísun höfundarréttar – Þú verður að tilgreina viðurkenningu á höfundarréttindum, gefa upp tengil á notkunarleyfið og gefa til kynna ef breytingar hafa verið gerðar. Þú getur gert þetta á einhvern ásættanlegan máta, en ekki á nokkurn þann hátt sem bendi til þess að leyfisveitandinn styðji þig eða notkun þína á verkinu. Deila eins – Ef þú breytir, yfirfærir eða byggir á þessu efni, þá mátt þú eingöngu dreifa því verki með sama eða svipuðu leyfi og upprunalega verkið er með.
	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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