Talk:Polyploidy

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There is little more than a dicdef here; I propose moving the Haploidy, Diploidy, Haploidisation, Polyploidy, and Aneuploidy pages to Ploidy. You have to read all those articles to understand ploidy anywho. I'll be happy to do the merge after approvial. Lefty 16:03, 2005 Mar 12 (UTC)

also Haplodiploidy. Lefty 16:09, 2005 Mar 12 (UTC)

The rationalistation it should go more like this:
Ploidy + Haploidy + Haploidisation + Diploidy (regular ploidy)
Aneuploidy + monosomy + trisomy (abnormal number of chromosomes)
Polyploidy and its variants (doubling of chromosome numbers) --

I am planning to expnd poliploidy significantly, so a merge would not be helpful at this point.

nixie 22:11, 13 Mar 2005 (UTC)

There are triploid species of wheat? I don't know enough about wheat to definitively reject this, but it sounds absurd. Sporophytes must have a ploidy that is a multiple of two...I can't imagine how a triploid would be fertile.

Wheat is is hexaploid (6n), which is not the same a triploid (3n). Triploids are normally sterile.--nixie 22:11, 13 Mar 2005 (UTC)

== References == Please put references in the text and in the "references" section. "Further" reading is for documents that were not used but could interest the reader to learn more.

1 Polyploidy in humans (?)
2 Abberations in diploidy
3 Success of various polyploid species
4 A summary figure for all polyploids

[edit] Polyploidy in humans (?)

User:tcopley I've submitted a proposed update to the polyploidy in humans section of the article. Polyploidy in humans is possible although it is rare, in the liver is the biggest example i've been able to find; true polyploidy refers to a complete gnome number shift, aneuploidy is an unbalence in the number of chromosomes. (eg extra X chromosome) I think this distinction needs to be made in refrence to polyploidy in humans.

[edit] Abberations in diploidy

The article says: "Where an organism is normally diploid, some spontaneous aberrations may occur which are usually caused by a hampered cell division." What is the significance of diploidy abberations in relation to polyploidy? This seems completely out of place as the second sentence of the article! The sentence is even ambiguous. What does "normally" mean here? -Pgan002 20:02, 20 September 2006 (UTC)

Hope this helps, hope this is what you are looking for: Normally means in 'wild type', The average ploidy found across all healthy organisms of the species. The idea that an abberant mitotic event can result in a new cell with 2x the number of chromosomes is a big deal to evolutionary scientists. This spontaneous chromosome doubling allows for lots of cool things to happen in nature: plants can't often pollinate other species because their chromosome have no homologues to align with during miosis (forget all the other things that hamper cross pollinating) but a chromosome doubling event provides a solution, double chromosomes by definition have a homologus partner to line up next to. This sort of strange situation may sound ridiculous but without it we wouldn't have wheat! Bread Wheat is the product of two such merge-and-double events. Even humans cna use this info. A researcher, Karpechenko, tried to make a plant with the leaves of cabbage and the roots of a radish, he crossed them, happened to get a doubling event, and produced the world's first man made species : Raphanobrassica. Unfortunatly he got the leaves of radish and the roots of cabbage, hehe.. Hope this is the explanation you're looking for, I do agree that the sentance you're citing is poorly written tho! Adenosine | Talk 08:55, 21 September 2006 (UTC)

[edit] Success of various polyploid species

I think this page needs to discuss the success of various species that exhibit polyploidy, such as the American Elm, or the Dandelion. Is there a scientific consensus about whether (and why?) there is an evolutionary benefit to polyploidy? Cazort 13:52, 26 September 2006 (UTC)