A life cycle is a period involving one generation of an organism through means of reproduction, whether through asexual reproduction or sexual reproduction. In regard to its ploidy, there are three types of cycles:

• haplontic life cycle
• diplontic life cycle
• diplobiontic life cycle (also referred to as diplohaplontic, haplodiplontic, or dibiontic life cycle)

These three types of cycles feature alternating haploid and diploid phases (n and 2n). The haploid organism becomes diploid through fertilization, which joins of gametes. This results in a zygote which then germinates. To return to a haploid stage, meiosis must occur (see Cell division). The cycles differ in the product of meiosis, and whether mitosis (growth) occurs. Zygotic and gametic meioses have one mitotic stage and form: during the n phase in zygotic meiosis and during the 2n phase in gametic meiosis. Therefore, zygotic and gametic meiosis are collectively term haplobiontic (single meiosis per phase). Sporic meiosis, on the other hand, has two meiosis events (diplobiontic): one in each phase.

Haplontic life cycle

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The #Forrester Wave™: IT Asset Life-Cycle Management, Q2 2009 #ITALM http://bit.ly/59xQB7
ggheorghiu (Gabriel Gheorghiu) Mon, 21 Dec 2009 22:12:28 -0000
The #Forrester Wave™: IT Asset Life-Cycle Management, Q2 2009 #ITALM http://bit.ly/59xQB7
@clarabelle80085 @KickOH at work in the slum. Feeling that life cycle. City work isn't what it's all hyped up to be. DJ or public servant.
NathanMillson (Nathan Millson) Mon, 21 Dec 2009 22:10:18 -0000
@clarabelle80085 @KickOH at work in the slum. Feeling that life cycle. City work isn't what it's all hyped up to be. DJ or public servant.
Are you stuck in that gut-wrenching, migraine producing, nervous breakdown of a life cycle? Options@ GoTrump http://budurl.com/2we4r
GardenGrown (Geri Garrison) Mon, 21 Dec 2009 21:26:23 -0000
Are you stuck in that gut-wrenching, migraine producing, nervous breakdown of a life cycle? Options@ GoTrump http://budurl.com/2we4r
Eat, nap, write... then do it all again. Such a vicious life cycle.
mandi_morgue (Amanda King) Mon, 21 Dec 2009 20:27:57 -0000
Eat, nap, write... then do it all again. Such a vicious life cycle.
RT @thomassmithh: 'i stood at the 358 bus stop for an hour and a half today and saw the whole life cycle of rain ! starts as rain then s ...
superfreak_kim (Kimmy Coupland) Mon, 21 Dec 2009 19:40:33 -0000
RT @thomassmithh: 'i stood at the 358 bus stop for an hour and a half today and saw the whole life cycle of rain ! starts as rain then s ...
'i stood at the 358 bus stop for an hour and a half today and saw the whole life cycle of rain ! starts as rain then sleet, hail then snow!'
thomassmithh (thomas smith) Mon, 21 Dec 2009 19:38:23 -0000
'i stood at the 358 bus stop for an hour and a half today and saw the whole life cycle of rain ! starts as rain then sleet, hail then snow!'

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