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Trivia or Other[edit]

If you record yourself saying Zygote, and play it backwards it sounds like Orgasm. Drrake (talk) 13:15, 16 November 2013 (UTC)

Actually, there is no 2n single-celled zygote in humans. When sperm enters egg, each replicates its DNA and then the pronuclei merge. That means you have a 4n single-celled zygote until the first cleavage into a 2n two-celled zygote (aka 2 blastomere stage). Source: Langman's Medical Embryology Kleinburgerei (talk) 00:32, 20 February 2015 (UTC)

Probably Wrong Information[edit]

I'm no developmental biologist but I believe that meiosis occurs before fertilization of the oocyte (for egg and sperm formation). Any expert please correct this and expand if possible. America has already polluted my mind and I only hope to rid its citizens of further contamination.

meiosis is already complete in the sperm. the egg is frozen in metaphase of meiosis II. fertilization triggers its completion of meiosis. then the sperm's 1n DNA pronucleus approaches the egg's 1n DNA pronucleus. meanwhile DNA is replicated, so we have 2n sperm DNA and 2n egg DNA. the pronuclei merge and immediately begin mitosis, which after cytokinesis results in two 2n blastomeres. Kleinburgerei (talk) 11:41, 21 February 2015 (UTC)

Learn to be your own teacher. Your own intuition and natural pattern recognition is greater than any book or any teacher. Books and teachers are for nothing more than to simply answer the questions that you do not have time to answer; time is gold when death lurks in the distance. In my opinion, if this stub is truly discovered to be faulty, it becomes a very good example of someone elses error (most likely by mistake) leading to the formation of a weak mind with a weak foundation. Weak minds are contagious by means of communication. Don't take my words or anyone's words to heart but see the essence of what is being said and use your "god" given intuition to act in the fashion which you beleive is correct. Newton, Mendel, Darwin, Einstein and others didn't simply accept what people told them, they basically went back to 1 + 0 = 1 and worked their way up from there. Once again this is just a simple man's opinion.

Simon T.

Univ. of Wash.

The article is correct, viz. biological life cycle. Better late than never, --Mgreenbe 14:51, 12 November 2005 (UTC)

How long?[edit]

How long is a zygote a zygote? Or how long is it from the time that it forms to the time that it begins splitting?

30 hours. then it completes the first mitosis into 2 blastomeres. Kleinburgerei (talk) 11:44, 21 February 2015 (UTC)
  • For humans, at "about" the fifth day it is considered an embryo. I'm not sure if this is the time of the very first division or not. Wikipedia also seems unclear, e.g. in Human development (biology). --JMD (talkcontribs) 01:23, 19 July 2006 (UTC)
  • According to "Psychology" (Lefton, 2006), implantation in the uterine wall is what causes it to be an embryo. (First division occurs within ten hours). Makes sense. If someone can confirm this distinction from a more general medically source, the article would benefit. --JMD (talkcontribs) 14:52, 19 July 2006 (UTC)
Implantation is when the embryonic stage begins. After cleavage begins, the proper terminology is, I believe, morula, then blastocyst. (talk) 16:34, 7 December 2009 (UTC)

Fourula, Morula...[edit]

Is the four celled zygote/embryo called forula, and the 8+ celled stage called a morula?

lol, is that a pun? the etymology of morula is the Greek word for "mulberry", not "more" as in more cells. it consists of 16 cells. Kleinburgerei (talk) 11:45, 21 February 2015 (UTC)

Biparental zygote[edit]

in reference to merging the two article, i would think it best to merge them. given that the article on Biparental zygote is nothing more then a definition, i think it would fit best under a subheading of zygote.

Done - Nabla 21:26, 6 August 2007 (UTC)


We need a picture of an actual zygote, as per embryo, fetus, baby, child, adolescent, adult, etc. Junulo (talk) 17:05, 30 December 2007 (UTC)

how many chromosomes does a zygote have? —Preceding unsigned comment added by (talk) 06:16, 15 January 2008 (UTC)

Not sure why this question ended up under the picture heading, but the number of chromosomes a zygote has will vary depending on the number of chromosomes of the adult organism. any zygote will have twice as many chromosomes as the sperm or ovum cell that produced it. In humans, a zygote has 23 pairs of chromosomes. More to the point, I don't think chromosome count belongs in the zygote article. Wilbiddle42 (talk) 07:02, 15 April 2009 (UTC)

Agreed about how this article ended up in this section. A zygote is a diploid organism, meaning that it receives genes from both parents. It has both sets of chromosomes, as Wilbiddle42 states.--MrNiceGuy1113 (talk) 19:47, 26 April 2012 (UTC)

Lead language[edit]

Ok, I'll do it. For some reason, User:Spotfixer finds this language inappropriate, poor written and/or biased. I disagree and instead of WP:ANI, this belongs here. I've reinserted it. -- Ricky81682 (talk) 22:09, 15 February 2009 (UTC)

Ok, a possible odd concern is that the language implies zygote => blastocyst while the infobox goes to embryo and the template goes to Cleavage (embryo). If someone could clarify that. -- Ricky81682 (talk) 22:13, 15 February 2009 (UTC)
Embryo = from zygote to nine weeks, at which time it's a fetus. arimareiji (talk) 22:20, 15 February 2009 (UTC)
I.e. a zygote, a blastocyst, an embryoblast, etc are all embryos. arimareiji (talk) 22:23, 15 February 2009 (UTC)
Is the time period given by Arimareiji (zygote to 9 weeks) for a human, mammalian organism, etc.?--MrNiceGuy1113 (talk) 19:51, 26 April 2012 (UTC)
No, I generally understand. I suspected it was just a matter of using terms generally and specifically at the same time. Just pointing out something someone should clarify. Frankly, I'm just surprised this article is just a stub and isn't a hostile controversial mess (for what that's worth). Also note that blastocyst claims five days, not four. -- Ricky81682 (talk) 22:25, 15 February 2009 (UTC)
I clarified the bit about cleavage. It occurs simultaneously with the thing being a zygote.Ferrylodge (talk) 22:34, 15 February 2009 (UTC)

Fertilized egg[edit]

"Fertilized egg" redirects here, however there are no fertilized eggs; when the egg and sperm join, they form a zygote. A zygote is not an egg. (talk) 16:36, 7 December 2009 (UTC)

I think that this question can be up for debate. I have seen a fertilized egg defined as the moment an egg and sperm join or when the egg starts to undergo development. Someone who has a degree in developmental biology really needs to say if fertilized egg is an appropriate redirect to this page.--MrNiceGuy1113 (talk) 20:01, 26 April 2012 (UTC)
However, I just read that when an egg is fertilized it is not longer considered and egg and is now a zygote.--MrNiceGuy1113 (talk) 20:09, 26 April 2012 (UTC)
I think that "fertilized egg" is common usage for zygote even though it is technically incorrect. Thus the redirect seems appropriate to me. --Biolprof (talk) 18:02, 29 June 2012 (UTC)
sounds correct to me. source: physiologist Kleinburgerei (talk) 11:48, 21 February 2015 (UTC)

Zygote planted elsewhere on the body[edit]

Are there occurrences that zygote plants elsewhere on the body of human (female or even stranger - male?) —Preceding unsigned comment added by (talk) 21:22, 1 January 2011 (UTC)

yes, it is called an ectopic pregnancy. Kleinburgerei (talk) 11:48, 21 February 2015 (UTC)


Since a zygote is a single cell after fertilization, I do not think it exist for 5 days and then immediately becomes a multi-cellular blastocyst on the fifth day. It cleaves to form blastomeres.Clucaj (talk) 14:26, 26 March 2013 (UTC)

Assessment comment[edit]

The comment(s) below were originally left at Talk:Zygote/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

rated top as high school/SAT biology content - tameeria 15:14, 17 February 2007 (UTC)

Last edited at 15:14, 17 February 2007 (UTC). Substituted at 11:20, 30 April 2016 (UTC)

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