Talk:Sex-determination system

message: Gonosome redirects here, but this article doesn't even mention the term, much less define it!
--91.63.214.210 (talk) 19:40, 10 January 2008 (UTC)
thread_title:  Redirection 

message: The article seems a bit sketchy. From a Maths book I see a reference to a 'reverse' xy system in Birds, Fish & Amphibians, however correct that is; presumably it's a reference to what is called the wz system, the article only refers specifically to birds & insects. It would be interesting to know a bit more categorically what different species' systems are.
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I have read information to the effect that the WW:WZ system for birds AND snakes, (i'm not sure about insects) is a reverse xy system in that as the articles says two of the same chromosomes are needed for male determination, instead of the XX style in human.
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I've always heard it discussed as ZW .. rather than WZ.  Anyone else?
I have heard of it as the ZW system. And this way makes more sense to me, because it is the first letter that is the base. Just like how the genotypes of the different sexes of humans are XX and XY (where the first letter of both is the same), the genotypes of, say, chickens, are ZZ and ZW (The Z is analogous to the X, because it alone does not signify a gender, whereas the presence of a W chromosome or a Y chromosome does). Kirbytime 00:01, 13 April 2006 (UTC)
thread_title:  Fish, Amphibians 

message: I'm linking this article to them, and vice versa:
*X0 sex-determination system
*ZW sex-determination system
*Haplo-diploid sex-determination system
This is going to turn out great, I know it =) Kirbytime 23:40, 12 April 2006 (UTC)
thread_title:  I've created articles on the different kinds 

message: A komodo dragon producing offspring by parthenogenesis at a London zoo is in the news currently. Press reports describe that the offspring must be male.
Please add specifications for Komodo dragons to the article (and the Komodo Dragon article as needed) explaining this female producing males situation.
:*DonePhorofor (talk) 19:54, 9 January 2012 (UTC)
thread_title:  In the News -- Parthenogenic Komodo Lizards 

message: I don't think this artikle is very clarifying. Sex is determined by the sex hormones, oestrogens on the one hand an testosteron on the other hand. In a sensitive phase the indifferent gonads of the embryo (or adult clown fish) will produce either male or female hormones. When this process starts the hormone production will follow a positive feedback loop. The hormone producing cells will produce still more of the hormone and this will influence other factors as the morfology of the germ cells. When the development has a male pathway "Anti Mullerian Duct Factor" will be produced which will eliminate the formation of the Mullerian duct (uterus and ovarian duct). 
The sex chromosomes will play a part in the first formation of male or female hormones in the primordial gonad in a manner that is still unclear. The basic formation and determination of gender is however a hormonal affair. 
Some fish for instance can be sex reversed when treated a few weeks after the hatching of the eggs with synthetic hormones. This will result in for instance fish which are genetically female (XX) but will function as males. When these fish fertilize a normal female, all female offspring (XX) will result as the XX constitution of the offspring will predetermine them as females.
The temperature effect with crocodiles can be explained in the same manner.
Viridiflavus 13:46, 24 February 2007 (UTC)
thread_title: No mention of sex hormones!!

message: What about XXY, XYY in humans?  —Preceding unsigned comment added by 46.70.66.76 (talk) 07:33, 16 May 2011 (UTC)
thread_title:  What about others? 

message: "All sex chromosomes started out as an original autosome of an original reptile that relied upon temperature to determine the sex of offspring. After the mammals separated..." - but mammals aren't reptiles! (may be it should mention amphibians?)Rnnsh (talk) 17:31, 30 May 2012 (UTC)
thread_title:  Mammals aren't reptiles 

message: Substituted at 05:50, 30 April 2016 (UTC)
thread_title: Assessment comment

message: It's a fairly good article. But given the title, it should cover the entire tree of life, including e.g. plants. Or rather, the title should be changed to ANIMAL Sex-determination system. — Preceding unsigned comment added by Hhbruun (talk • contribs) 
:We go by WP:Common name. Flyer22 Reborn (talk) 23:01, 31 October 2018 (UTC)
thread_title:  plants? - change title 

message: I don’t see any sources cited in the lead.
CycoMa (talk) 23:54, 12 October 2020 (UTC)
thread_title:  There are zero sources in the lead 

message: I’m moving stuff from sex over to here.CycoMa (talk) 02:48, 3 August 2021 (UTC)
thread_title:  Moving stuff 

message: The part on XY sex determination needs some trimming it is honestly a little too long to be honest.CycoMa (talk) 20:11, 25 August 2021 (UTC)
thread_title:  XY sex determination needs trimming 

message: Would heterostyly fit in one of these headings? Some plants, as well as the male / female system, also have physical differences differentiating each sex into classes which can only breed with each other - pin males can only fertilise thrum females and vice-versa, and at least some species seem to have genetic factors making homostylous matches infertile.
I don't have the background in botany to write this up properly, though, or to fit in in the right place - any takers?
Philculmer (talk) 16:30, 20 October 2023 (UTC)
replies: text: white throated sparrows do something very similar, I came on here to mention that because it's pretty neat JustAnotherCatLover... (talk) 15:20, 23 November 2023 (UTC)
thread_title:  Environmental factors / genetic factors