Talk:Biological life cycle

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K and r selection[edit]

I think the K and r selection section currently in sexual selection belongs here (ie life history), or in a closely related entry, life history theory?. --Pete Hurd

No, K and r are population biology topis; this is cell biology (perhaps). Dysmorodrepanis (talk) 21:03, 10 April 2009 (UTC)

Rename Page[edit]

If this page were retitled 'Life cycle' it would make for tidier internal links from other pages (DMC)

Not sure why that would be true (please explain), but as the word has more meaning than just as a biological phenomenon, it seems unwise to change it. - Marshman 02:22, 14 February 2006 (UTC)
I would tend to agree that it should redirect here (or rather this page be moved to life cycle with a dab page created, though checking the links at life cycle for context seems to indicate there are a reasonable portion of non-biology links. Richard001 10:14, 11 June 2007 (UTC)


Hydrozoa and "worms" and many others are diplonts as typical for animals, but they differ from the standard strategy in having an asexual cloining phase. This article needs expansion in that direction. 21:03, 10 April 2009 (UTC)

Use of specialized language[edit]

The subject of this article of is of fundamental importance in biology, and as such it is (I presume) well understood by biologists. It gives a concise overview of the subject, but does so by using language foreign to the non-specialist. It is true that dificult terminology is hyperlinked, but this does little to improve readability. I think it would be good to unpack some of the jargon within the article. This would make it more comprehensible to non-specialiststs, who I would presume are the target audience of the article. Tapatio (talk) 07:45, 11 August 2009 (UTC)

Possibly, though it's at a perfect level for undergraduate biology students! Seriously though, I think Alternation of generations provides a pretty good summary of the basic concept of diploid and haploid life phases, and the broader idea of a life history can then be understood by comparing that with mammalian reproduction, which most people are more familiar with. You don't exactly want to be defining words like meiosis or spore in this article, right? Dewert (talk) 22:58, 4 December 2009 (UTC)

life cycle of a bear[edit]

life cycle of a bear —Preceding unsigned comment added by (talk) 01:52, 20 November 2009 (UTC)

seriously? a bear? no way! Dewert (talk) 22:54, 4 December 2009 (UTC)


According to Noctilucales#Characteristics - admittedly after I fixed a probable spelling mistake - these (and speculatively other dinoflagellates) also have gametic meiosis. Is the list supposed to be exhaustive? Should we add Noctoluticales to the list? Cucamber (talk) 19:58, 7 January 2010 (UTC)

Limits of definition of "biological life cycle"[edit]

Just a note that this "life cycle" in this context only refers to passing of one generation to the next. It does NOT refer to life cycle from original conception (the "first") to extinction (the "last"). -- (talk) 02:27, 8 February 2011 (UTC)

Grammatical errors in the first paragraph[edit]

I see many grammatical errors in the first paragraph and some sentences are not even complete. English isn't my native language so I'm not too confident about correcting them myself. — Preceding unsigned comment added by (talk) 17:03, 3 March 2012 (UTC)

Incorrect statement in Haplodiplontic life cycle section?[edit]

The Haplodiplontic life cycle section has this sentence, which appears to have been copy-pasted from the Diplontic life cycle section:

"In the whole cycle, gametes are usually the only haploid cells, and mitosis usually occurs only in the diploid phase."

I'm not an expert on this, but this seems factually incorrect to me, since a Haplodiplontic life cycle would have a multicellular haploid phase, which would necessarily have to undergo mitosis. Could someone more knowledgeable than me correct this if I'm right? Equaaldoors (talk) 22:52, 11 March 2012 (UTC)

Types of cycle[edit]

I think the types of life cycle could be organized in the following manner in the article, according to [1], [2] and [3], and the french article:

  • types of life cycle according to the number of generations in a cycle (I don't know if this classification can be applied to unicellular organisms like Chlamydomonas, it depends of the definiton of generation...):
  • monogenetic
  • digenetic
  • trigenetic
(Note: this terms are used too to describe the number of hosts in cycles of parasites.)
  • types of life cycle according to the nuclear phases present:
  • haplophasic (only zygote is diploid)
  • diplophasic (only gametes are haploid)
  • diplohaplophasic (two vegetative phases, haploid and diploid)
(Note: Vuillemin created the terms haplophase and diplophase.)
  • types of cycle according to the moment when meiosis occur:
  • haplont (=haplophasic?): zygotic meiosis
  • diplont (=diplophasic?): gametic meiosis
  • diplohaplont (=diplohaplophasic?): sporic meiosis
(Note: it seems that Feldmann ([4], [5]) was the first that used the terms haplophasic, diplophasic and diplohaplophasic to describe cycles as defined here.)
(Note 2: maybe Max Hartmann or Svedellius created the terms haplont, diplont and diplohaplont)
(Note 3: some books [6] use the terms zygotic, gametic, sporic and somatic life cycles, others use haplontic, diplontic and diplohaplontic life cycles, and others [7] use asexual haploid cycle, sexual haploid cycle, diploid cycle and haplodiploid cycle.) — Preceding unsigned comment added by Zorahia (talkcontribs) 01:07, 7 November 2013 (UTC)
  • types of life cycle according to the number of individuals (=bionts):
  • haplobiont (it can occur in haplont and diplont cycles, and according with some authors, in diplohaplont cycles too)
  • diplobiont
(Note: Svedelius defined these cycles.)

Zorahia (talk) 15:21, 5 October 2013 (UTC)

As almost an aside, wikipedia is surprisingly deficient, it seems, in a definition of "generation" that would be appropriate here. I've added something to Generation (disambiguation), but it is not in an ideal form. Sminthopsis84 (talk) 21:24, 6 October 2013 (UTC)

It's important also to keep WP:MTAU in mind: no matter what is discussed, it needs to be made understandable to people who don't know or don't care what haplophasic meiosis is. I'm an educated biologist and am familiar with zygotic and gametic meiosis, yet never heard the terms haplontic or diplontic in my life, thus their use as headers may further burden less-famililar readers. The life cycle is a very fundamental concept that needs a thorough yet comprehensible explanation. Rather than potentially overwhelm nonspecialist or non-collegiate readers, this article might better serve as an overview or introduction, with haplodiplonty etc. described in depth in their own article for those interested. Most basic information should be summarized first, leading to more complex discussion or soft redirects when it gets into the nitty gritty. Thus, largely unknown terms like sporocyst and redia should probably not be in the first paragraph of the lead.--Animalparty-- (talk) 03:55, 30 March 2014 (UTC)

Agree. It is also important, I think, to keep this page on life cycles reasonably free of material duplicated from alternation of generations. Sminthopsis84 (talk) 15:06, 30 March 2014 (UTC)