Talk:XY sex-determination system
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I am not going to do any real writing today. Nonetheless, for this article we really need to remove some of the "Redirects". We need separate articles for this subject, as well as for the X Chromosome and the Y Chromosome. Much research exists on the genes found on these chromosomes, each of which can be the subject of an entire article. RK 22:24, Feb 13, 2005 (UTC)
- I definately think that there should be independent articles for the X and the Y chromosomes (an probably all the other human chromosomes at some point), plus this article on the sex-determination system. Fixing all the redirects will be interesting :). The Y chromosome in particular has potential to become a featured article --nixie 22:38, 13 Feb 2005 (UTC)
- Agreed, definitely scope for separate articles, although I think we should still include summaries and main article links in summary style in this article. I think the redirects have now been removed. --Lexor|Talk 23:48, Feb 14, 2005 (UTC)
!! I do not think XX males exists. The male cromosome must be present to get the testicle gene. On the other hand Y cromosome may not work correctly creating female or female like phenotype. !!
- There are males with things other than XY. See XYY syndrome and Klinefelter's syndrome.
I don't understand why the fruit fly is mentioned in this article, since it's not a mammal. AnonMoos 16:37, 14 January 2006 (UTC)
In Drosophila, males are XY, but sex is actually determined by the number of X chromosomes, so fruit flies are in the X-0 system. I'm going to add that, as well as the other systems. Kirbytime 17:20, 12 April 2006 (UTC)
- You are wrong. In order to get a fertile male, most Drosophila species require the Y chromosome. As I recall, it is not part of the doublesex pathway, but genes on the Y are required for proper formation of the vas efferens.
[edit] Other sex determination systems
Should each one have a separate article, or should they all be merged into a single one? Currently, there are also these:
which were all made by me (or will be). Thoughts? Kirbytime 17:45, 12 April 2006 (UTC)
- I guess it is about time to ask the question, "What do we mean by sex determination system?" Kribytime's classification of Drosophila as X0 is semi-valid if you are looking at mechanisms (dosage of X determines sex). However, Drosophila is an XY system -- normal females are XX; normal males are XY. While phenotypically classified as males, X0 flies are sterile (for the most part; there are some species where these males are fertile). My understanding was that this entry was simply on the gross chromosomal classification. For example, gingko trees would also fit in the XY system, although I have no idea how they use the X and Y specifically for sex determination. If we want this to be mechanisms, then it will take some serious rewriting. Ted 18:01, 12 April 2006 (UTC)
Ok, I think the confusion arose from the distinction between a fertile male and an infertile male. Yes, some X0 are infertile, but that genotype is still considered male, as opposed to female. Just like how humans with XXX genotypes are considered female (even though they might be infertile). Kirbytime 21:20, 12 April 2006 (UTC)
