Contents 1 Types 2 Animals 2.1 Humans 3 Plants 3.1 Crops 3.1.1 Examples 4 Fungi 5 Chromalveolata 6 Terminology 6.1 Autopolyploidy 6.2 Allopolyploidy 6.3 Paleopolyploidy 6.4 Karyotype 6.5 Paralogous 6.6 Homologous 6.7 Homoeologous 6.7.1 Example of homoeologous chromosomes 7 Bacteria 8 Archaea 9 See also 10 References 11 Further reading 12 External links

Types[edit] Organ-specific patterns of endopolyploidy (from 2x to 64x) in the giant ant Dinoponera australis Polyploid types are labeled according to the number of chromosome sets in the nucleus. The letter x is used to represent the number of chromosomes in a single set. triploid (three sets; 3x), for example seedless watermelons, common in the phylum Tardigrada[6] tetraploid (four sets; 4x), for example Salmonidae fish,[7] the cotton Gossypium hirsutum [8] pentaploid (five sets; 5x), for example Kenai Birch (Betula papyrifera var. kenaica) hexaploid (six sets; 6x), for example wheat, kiwifruit[9] heptaploid or septaploid (seven sets; 7x) octaploid or octoploid, (eight sets; 8x), for example Acipenser (genus of sturgeon fish), dahlias decaploid (ten sets; 10x), for example certain strawberries dodecaploid (twelve sets; 12x), for example the plants Celosia argentea and Spartina anglica[10] or the amphibian Xenopus ruwenzoriensis.

Animals[edit] Examples in animals are more common in non-vertebrates[11] such as flatworms, leeches, and brine shrimp. Within vertebrates, examples of stable polyploidy include the salmonids and many cyprinids (i.e. carp).[12] Some fish have as many as 400 chromosomes.[12] Polyploidy also occurs commonly in amphibians; for example the biomedically-important Xenopus genus contains many different species with as many as 12 sets of chromosomes (dodecaploid).[13] Polyploid lizards are also quite common, but are sterile and must reproduce by parthenogenesis.[citation needed] Polyploid mole salamanders (mostly triploids) are all female and reproduce by kleptogenesis,[14] "stealing" spermatophores from diploid males of related species to trigger egg development but not incorporating the males' DNA into the offspring. While mammalian liver cells are polyploid, rare instances of polyploid mammals are known, but most often result in prenatal death. An octodontid rodent of Argentina's harsh desert regions, known as the plains viscacha rat (Tympanoctomys barrerae) has been reported as an exception to this 'rule'.[15] However, careful analysis using chromosome paints shows that there are only two copies of each chromosome in T. barrerae, not the four expected if it were truly a tetraploid.[16] This rodent is not a rat, but kin to guinea pigs and chinchillas. Its "new" diploid [2n] number is 102 and so its cells are roughly twice normal size. Its closest living relation is Octomys mimax, the Andean Viscacha-Rat of the same family, whose 2n = 56. It was therefore surmised that an Octomys-like ancestor produced tetraploid (i.e., 2n = 4x = 112) offspring that were, by virtue of their doubled chromosomes, reproductively isolated from their parents. Polyploidy was induced in fish by Har Swarup (1956) using a cold-shock treatment of the eggs close to the time of fertilization, which produced triploid embryos that successfully matured.[17][18] Cold or heat shock has also been shown to result in unreduced amphibian gametes, though this occurs more commonly in eggs than in sperm.[19] John Gurdon (1958) transplanted intact nuclei from somatic cells to produce diploid eggs in the frog, Xenopus (an extension of the work of Briggs and King in 1952) that were able to develop to the tadpole stage.[20] The British Scientist, J. B. S. Haldane hailed the work for its potential medical applications and, in describing the results, became one of the first to use the word “clone” in reference to animals. Later work by Shinya Yamanaka showed how mature cells can be reprogrammed to become pluripotent, extending the possibilities to non-stem cells. Gurdon and Yamanaka were jointly awarded the Nobel Prize in 2012 for this work.[20] Humans[edit] Further information: Triploid syndrome True polyploidy rarely occurs in humans, although polyploid cells occur in highly differentiated tissue, such as liver parenchyma and heart muscle, and in bone marrow.[21] Aneuploidy is more common. Polyploidy occurs in humans in the form of triploidy, with 69 chromosomes (sometimes called 69,XXX), and tetraploidy with 92 chromosomes (sometimes called 92,XXXX). Triploidy, usually due to polyspermy, occurs in about 2–3% of all human pregnancies and ~15% of miscarriages.[citation needed] The vast majority of triploid conceptions end as a miscarriage; those that do survive to term typically die shortly after birth. In some cases, survival past birth may extend longer if there is mixoploidy with both a diploid and a triploid cell population present. Triploidy may be the result of either digyny (the extra haploid set is from the mother) or diandry (the extra haploid set is from the father). Diandry is mostly caused by reduplication of the paternal haploid set from a single sperm, but may also be the consequence of dispermic (two sperm) fertilization of the egg.[22] Digyny is most commonly caused by either failure of one meiotic division during oogenesis leading to a diploid oocyte or failure to extrude one polar body from the oocyte. Diandry appears to predominate among early miscarriages, while digyny predominates among triploid zygotes that survive into the fetal period.[citation needed] However, among early miscarriages, digyny is also more common in those cases <8.5 weeks gestational age or those in which an embryo is present. There are also two distinct phenotypes in triploid placentas and fetuses that are dependent on the origin of the extra haploid set. In digyny, there is typically an asymmetric poorly grown fetus, with marked adrenal hypoplasia and a very small placenta.[citation needed] In diandry, a partial hydatidiform mole develops.[22] These parent-of-origin effects reflect the effects of genomic imprinting.[citation needed] Complete tetraploidy is more rarely diagnosed than triploidy, but is observed in 1–2% of early miscarriages. However, some tetraploid cells are commonly found in chromosome analysis at prenatal diagnosis and these are generally considered 'harmless'. It is not clear whether these tetraploid cells simply tend to arise during in vitro cell culture or whether they are also present in placental cells in vivo. There are, at any rate, very few clinical reports of fetuses/infants diagnosed with tetraploidy mosaicism. Mixoploidy is quite commonly observed in human preimplantation embryos and includes haploid/diploid as well as diploid/tetraploid mixed cell populations. It is unknown whether these embryos fail to implant and are therefore rarely detected in ongoing pregnancies or if there is simply a selective process favoring the diploid cells.

Plants[edit] Speciation via polyploidy: A diploid cell undergoes failed meiosis, producing diploid gametes, which self-fertilize to produce a tetraploid zygote. Polyploidy is pervasive in plants and some estimates suggest that 30–80% of living plant species are polyploid, and many lineages show evidence of ancient polyploidy (paleopolyploidy) in their genomes.[23][24][25] Huge explosions in angiosperm species diversity appear to have coincided with the timing of ancient genome duplications shared by many species.[26] It has been established that 15% of angiosperm and 31% of fern speciation events are accompanied by ploidy increase.[27] Polyploid plants can arise spontaneously in nature by several mechanisms, including meiotic or mitotic failures, and fusion of unreduced (2n) gametes.[28] Both autopolyploids (e.g. potato [29]) and allopolyploids (e.g. canola, wheat, cotton) can be found among both wild and domesticated plant species. Most polyploids display novel variation or morphologies relative to their parental species, that may contribute to the processes of speciation and eco-niche exploitation.[24][28] The mechanisms leading to novel variation in newly formed allopolyploids may include gene dosage effects (resulting from more numerous copies of genome content), the reunion of divergent gene regulatory hierarchies, chromosomal rearrangements, and epigenetic remodeling, all of which affect gene content and/or expression levels.[30][31][32][33] Many of these rapid changes may contribute to reproductive isolation and speciation. However seed generated from interploidy crosses, such as between polyploids and their parent species, usually suffer from aberrant endosperm development which impairs their viability,[34][35] thus contributing to polyploid speciation. Lomatia tasmanica is an extremely rare Tasmanian shrub that is triploid and sterile; reproduction is entirely vegetative, with all plants having the same genetic constitution. There are few naturally occurring polyploid conifers. One example is the Coast Redwood Sequoia sempervirens, which is a hexaploid (6x) with 66 chromosomes (2n = 6x = 66), although the origin is unclear.[36] Aquatic plants, especially the Monocotyledons, include a large number of polyploids.[37] Crops[edit] The induction of polyploidy is a common technique to overcome the sterility of a hybrid species during plant breeding. For example, Triticale is the hybrid of wheat (Triticum turgidum) and rye (Secale cereale). It combines sought-after characteristics of the parents, but the initial hybrids are sterile. After polyploidization, the hybrid becomes fertile and can thus be further propagated to become triticale. In some situations, polyploid crops are preferred because they are sterile. For example, many seedless fruit varieties are seedless as a result of polyploidy. Such crops are propagated using asexual techniques, such as grafting. Polyploidy in crop plants is most commonly induced by treating seeds with the chemical colchicine. Examples[edit] Triploid crops: some apple varieties (e.g. Belle de Boskoop, Jonagold, Mutsu, Ribston Pippin), banana, citrus, ginger, watermelon[38] Tetraploid crops: very few apple varieties, durum or macaroni wheat, cotton, potato, canola/rapeseed, leek, tobacco, peanut, kinnow, Pelargonium Hexaploid crops: chrysanthemum, bread wheat, triticale, oat, kiwifruit[9] Octaploid crops: strawberry, dahlia, pansies, sugar cane, oca (Oxalis tuberosa)[39] Dodecaploid crops: some sugar cane hybrids [40] Some crops are found in a variety of ploidies: tulips and lilies are commonly found as both diploid and triploid; daylilies (Hemerocallis cultivars) are available as either diploid or tetraploid; apples and kinnow mandarins can be diploid, triploid, or tetraploid.

Fungi[edit] Schematic phylogeny of the fungi. Red circles indicate polyploidy, blue squares indicate hybridization. From Albertin and Marullo, 2012[41] Besides plants and animals, the evolutionary history of various fungal species is dotted by past and recent whole-genome duplication events (see Albertin and Marullo 2012[41] for review). Several examples of polyploids are known: autopolyploid: the aquatic fungi of genus Allomyces,[42] some Saccharomyces cerevisiae strains used in bakery,[43] etc. allopolyploid: the widespread Cyathus stercoreus,[44] the allotetraploid lager yeast Saccharomyces pastorianus,[45] the allotriploid wine spoilage yeast Dekkera bruxellensis,[46] etc. paleopolyploid: the human pathogen Rhizopus oryzae,[47] the Saccharomyces genus,[48] etc. In addition, polyploidy is frequently associated with hybridization and reticulate evolution that appear to be highly prevalent in several fungal taxa. Indeed, homoploid speciation (i.e., hybrid speciation without a change in chromosome number) has been evidenced for some fungal species (e.g., the basidiomycota Microbotryum violaceum [49]). Schematic phylogeny of the Chromalveolata. Red circles indicate polyploidy, blue squares indicate hybridization. From Albertin and Marullo, 2012[41] As for plants and animals, fungal hybrids and polyploids display structural and functional modifications compared to their progenitors and diploid counterparts. In particular, the structural and functional outcomes of polyploid Saccharomyces genomes strikingly reflect the evolutionary fate of plant polyploid ones. Large chromosomal rearrangements[50] leading to chimeric chromosomes[51] have been described, as well as more punctual genetic modifications such as gene loss.[52] The homoealleles of the allotetraploid yeast S. pastorianus show unequal contribution to the transcriptome.[53] Phenotypic diversification is also observed following polyploidization and/or hybridization in fungi,[54] producing the fuel for natural selection and subsequent adaptation and speciation.

Chromalveolata[edit] Other eukaryotic taxa have experienced one or more polyploidization events during their evolutionary history (see Albertin and Marullo, 2012[41] for review). The oomycetes, which are non-true fungi members, contain several examples of paleopolyploid and polyploid species, such as within the Phytophthora genus.[55] Some species of brown algae (Fucales, Laminariales [56] and diatoms [57]) contain apparent polyploid genomes. In the Alveolata group, the remarkable species Paramecium tetraurelia underwent three successive rounds of whole-genome duplication [58] and established itself as a major model for paleopolyploid studies.

Terminology[edit] Autopolyploidy[edit] Autopolyploids are polyploids with multiple chromosome sets derived from a single taxon. Two examples of natural autopolyploids are the piggyback plant, Tolmiea menzisii[59] and the white sturgeon, Acipenser transmontanum.[60] Most instances of autopolyploidy result from the fusion of unreduced (2n) gametes, which results in either triploid (n + 2n = 3n) or tetraploid (2n + 2n = 4n) offspring.[61] Triploid offspring are typically sterile (as in the phenomenon of 'triploid block'), but in some cases they may produce high proportions of unreduced gametes and thus aid the formation of tetraploids. This pathway to tetraploidy is referred to as the “triploid bridge”.[61] Triploids may also persist through asexual reproduction. In fact, stable autotriploidy in plants is often associated with apomictic mating systems.[62] In agricultural systems, autotriploidy can result in seedlessness, as in watermelons and bananas.[63] Triploidy is also utilized in salmon and trout farming to induce sterility.[64][65] Rarely, autopolyploids arise from spontaneous, somatic genome doubling, which has been observed in apple (Malus domesticus) bud sports.[66] This is also the most common pathway of artificially induced polyploidy, where methods such as protoplast fusion or treatment with colchicine, oryzalin or mitotic inhibitors are used to disrupt normal mitotic division, which results in the production of polyploid cells. This process can be useful in plant breeding, especially when attempting to introgress germplasm across ploidal levels.[67] Autopolyploids possess at least three homologous chromosome sets, which can lead to high rates of multivalent pairing during meiosis (particularly in recently formed autopolyploids, a.k.a. neopolyploids) and an associated decrease in fertility due to the production of aneuploid gametes.[68] Natural or artificial selection for fertility can quickly stabilize meiosis in autopolyploids by restoring bivalent pairing during meiosis, but the high degree of homology among duplicated chromosomes causes autopolyploids to display polysomic inheritance.[69] This trait is often used as a diagnostic criterion to distinguish autopolyploids from allopolyploids, which commonly display disomic inheritance after they progress past the neopolyploid stage.[70] While most polyploid species are unambiguously characterized as either autopolyploid or allopolyploid, these categories represent the ends of a spectrum between of divergence between parental subgenomes. Polyploids that fall between these two extremes, which are often referred to as segmental allopolyploids, may display intermediate levels of polysomic inheritance that vary by locus.[71][72] About half of all polyploids are thought to be the result of autopolyploidy,[73][74] although many factors make this proportion hard to estimate.[75] Allopolyploidy[edit] Allopolyploids or amphipolyploids or heteropolyploids are polyploids with chromosomes derived from two or more diverged taxa. As in autopolyploidy, this primarily occurs through the fusion of unreduced (2n) gametes, which can take place before or after hybridization. In the former case, unreduced gametes from each diploid taxa – or reduced gametes from two autotetraploid taxa – combine to form allopolyploid offspring. In the latter case, one or more diploid F1 hybrids produce unreduced gametes that fuse to form allopolyploid progeny.[76] Hybridization followed by genome duplication may be a more common path to allopolyploidy because F1 hybrids between taxa often have relatively high rates of unreduced gamete formation – divergence between the genomes of the two taxa result in abnormal pairing between homoeologous chromosomes or nondisjunction during meiosis.[76] In this case, allopolyploidy can actually restore normal, bivalent meiotic pairing by providing each homoeologous chromosome with its own homologue. If divergence between homoeologous chromosomes is even across the two subgenomes, this can theoretically result in rapid restoration of bivalent pairing and disomic inheritance following allopolyploidization. However multivalent pairing is common in many recently formed allopolyploids, so it is likely that the majority of meiotic stabilization occurs gradually through selection.[68][70] Because pairing between homoeologous chromosomes is rare in established allopolyploids, they may benefit from fixed heterozygosity of homoeologous alleles.[77] In certain cases, such heterozygosity can have beneficial heterotic effects, either in terms of fitness in natural contexts or desirable traits in agricultural contexts. This could partially explain the prevalence of allopolyploidy among crop species. Both bread wheat and Triticale are examples of an allopolyploids with six chromosome sets. Cotton is an allotetraploid with multiple origins. In Brassicaceous crops, the Triangle of U describes the relationships between the three common diploid Brassicas (B. oleracea, B. rapa, and B. nigra) and three allotetraploids (B. napus, B. juncea, and B. carinata) derived from hybridization among the diploid species. A similar relationship exists between three diploid species of Tragopogon (T. dubius, T. pratensis, and T. porrifolius) and two allotetraploid species (T. mirus and T. miscellus).[78] Complex patterns of allopolyploid evolution have also been observed in animals, as in the frog genus Xenopus.[79] Paleopolyploidy[edit] This phylogenetic tree shows the relationship between the best-documented instances of paleopolyploidy in eukaryotes. Main article: Paleopolyploidy Ancient genome duplications probably occurred in the evolutionary history of all life. Duplication events that occurred long ago in the history of various evolutionary lineages can be difficult to detect because of subsequent diploidization (such that a polyploid starts to behave cytogenetically as a diploid over time) as mutations and gene translations gradually make one copy of each chromosome unlike the other copy. Over time, it is also common for duplicated copies of genes to accumulate mutations and become inactive pseudogenes.[80] In many cases, these events can be inferred only through comparing sequenced genomes. Examples of unexpected but recently confirmed ancient genome duplications include baker's yeast (Saccharomyces cerevisiae), mustard weed/thale cress (Arabidopsis thaliana), rice (Oryza sativa), and an early evolutionary ancestor of the vertebrates (which includes the human lineage) and another near the origin of the teleost fishes. Angiosperms (flowering plants) have paleopolyploidy in their ancestry. All eukaryotes probably have experienced a polyploidy event at some point in their evolutionary history. Karyotype[edit] Main article: Karyotype A karyotype is the characteristic chromosome complement of a eukaryote species.[81][82] The preparation and study of karyotypes is part of cytology and, more specifically, cytogenetics. Although the replication and transcription of DNA is highly standardized in eukaryotes, the same cannot be said for their karotypes, which are highly variable between species in chromosome number and in detailed organization despite being constructed out of the same macromolecules. In some cases, there is even significant variation within species. This variation provides the basis for a range of studies in what might be called evolutionary cytology. Paralogous[edit] The term is used to describe the relationship between duplicated genes or portions of chromosomes that derived from a common ancestral DNA. Paralogous segments of DNA may arise spontaneously by errors during DNA replication, copy and paste transposons, or whole genome duplications. Homologous[edit] The term is used to describe the relationship of similar chromosomes that pair at mitosis and meiosis. In a diploid, one homolog is derived from the male parent (sperm) and one is derived from the female parent (egg). During meiosis and gametogenesis, homologous chromosomes pair and exchange genetic material by recombination, leading to the production of sperm or eggs with chromosome haplotypes containing novel genetic variation. Homoeologous[edit] The term homoeologous, also spelled homeologous, is used to describe the relationship of similar chromosomes or parts of chromosomes brought together following inter-species hybridization and allopolyploidization, and whose relationship was completely homologous in an ancestral species. In allopolyploids, the homologous chromosomes within each parental sub-genome should pair faithfully during meiosis, leading to disomic inheritance; however in some allopolyploids, the homoeologous chromosomes of the parental genomes may be nearly as similar to one another as the homologous chromosomes, leading to tetrasomic inheritance (four chromosomes pairing at meiosis), intergenomic recombination, and reduced fertility. Example of homoeologous chromosomes[edit] Durum wheat is the result of the inter-species hybridization of two diploid grass species Triticum urartu and Aegilops speltoides. Both diploid ancestors had two sets of 7 chromosomes, which were similar in terms of size and genes contained on them. Durum wheat contains two sets of chromosomes derived from Triticum urartu and two sets of chromosomes derived from Aegilops speltoides. Each chromosome pair derived from the Triticum urartu parent is homoeologous to the opposite chromosome pair derived from the Aegilops speltoides parent, though each chromosome pair unto itself is homologous.

Bacteria[edit] Each Deinococcus radiodurans bacterium contains 4-8 copies of its chromosome.[83] Exposure of D. radiodurans to X-ray irradiation or desiccation can shatter its genomes into hundred of short random fragments. Nevertheless, D. radiodurans is highly resistant to such exposures. The mechanism by which the genome is accurately restored involves RecA-mediated homologous recombination and a process referred to as extended synthesis-dependent strand annealing (SDSA).[84] Azotobacter vinelandii can contain up to 80 chromosome copies per cell.[85] However this is only observed in fast growing cultures, whereas cultures grown in synthetic minimal media are not polyploid.[86]

Archaea[edit] The archaeon Halobacterium salinarium is polyploid[87] and, like D. radiodurans, is highly resistant to X-ray irradiation and desiccation, conditions that induce DNA double-strand breaks.[88] Although chromosomes are shattered into many fragments, complete chromosomes can be regenerated by making use of overlapping fragments. The mechanism employs single-stranded DNA binding protein and is likely homologous recombinational repair.[89]

See also[edit] Klerokinesis, a type of cell division that occurs after mitosis is complete, restoring a diploid chromosome number Polyploid complex Polysomy Sympatry

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Further reading[edit] Snustad, D. Peter; et al. (2006). Principles of Genetics (4th ed.). Hoboken, NJ: John Wiley & Sons. ISBN 0-471-69939-X.  The Arabidopsis Genome Initiative (2000). "Analysis of the genome sequence of the flowering plant Arabidopsis thaliana". Nature. 408 (6814): 796–815. Bibcode:2000Natur.408..796T. doi:10.1038/35048692. PMID 11130711.  Eakin, Guy S.; Behringer, Richard R. (2003). "Tetraploid development in the mouse". Developmental Dynamics. 228 (4): 751–66. doi:10.1002/dvdy.10363. PMID 14648853.  Gaeta, R. T.; Pires, J. C.; Iniguez-Luy, F.; Leon, E.; Osborn, T. C. (2007). "Genomic Changes in Resynthesized Brassica napus and Their Effect on Gene Expression and Phenotype". The Plant Cell Online. 19 (11): 3403–3417. doi:10.1105/tpc.107.054346. PMC 2174891 . PMID 18024568.  Gregory, T.R.; Mable, B.K. (2005). "Polyploidy in animals". In Gregory, T.R. The Evolution of the Genome. San Diego: Elsevier. pp. 427–517.  Jaillon, Olivier; Aury, Jean-Marc; Brunet, Frédéric; Petit, Jean-Louis; et al. (2004). "Genome duplication in the teleost fish Tetraodon nigroviridis reveals the early vertebrate proto-karyotype". Nature. 431 (7011): 946–57. Bibcode:2004Natur.431..946J. doi:10.1038/nature03025. PMID 15496914.  Paterson, Andrew H.; Bowers, John E.; Van De Peer, Yves; Vandepoele, Klaas (2005). "Ancient duplication of cereal genomes". New Phytologist. 165 (3): 658–61. doi:10.1111/j.1469-8137.2005.01347.x. PMID 15720677.  Raes, Jeroen; Vandepoele, Klaas; Simillion, Cedric; Saeys, Yvan; Van De Peer, Yves (2003). "Investigating ancient duplication events in the Arabidopsis genome". Journal of Structural and Functional Genomics. 3 (1–4): 117–29. doi:10.1023/A:1022666020026. PMID 12836691.  Simillion, C.; Vandepoele, K; Van Montagu, MC; Zabeau, M; Van De Peer, Y (2002). "The hidden duplication past of Arabidopsis thaliana". Proceedings of the National Academy of Sciences. 99 (21): 13627–32. Bibcode:2002PNAS...9913627S. doi:10.1073/pnas.212522399. JSTOR 3073458. PMC 129725 . PMID 12374856.  Soltis, Douglas E.; Soltis, Pamela S.; Schemske, Douglas W.; Hancock, James F.; Thompson, John N.; Husband, Brian C.; Judd, Walter S. (2007). "Autopolyploidy in Angiosperms: Have We Grossly Underestimated the Number of Species?". Taxon. 56 (1): 13–30. JSTOR 25065732.  Soltis DE, Buggs RJA, Doyle JJ, Soltis PS (2010). "What we still don't know about polyploidy". Taxon. 59: 1387–403. JSTOR 20774036. CS1 maint: Multiple names: authors list (link) Taylor, J. S.; Braasch, I; Frickey, T; Meyer, A; Van De Peer, Y (2003). "Genome Duplication, a Trait Shared by 22,000 Species of Ray-Finned Fish". Genome Research. 13 (3): 382–90. doi:10.1101/gr.640303. PMC 430266 . PMID 12618368.  Tate, J.A.; Soltis, D.E.; Soltis, P.S. (2005). "Polyploidy in plants". In Gregory, T.R. The Evolution of the Genome. San Diego: Elsevier. pp. 371–426.  Van De Peer, Yves; Taylor, John S.; Meyer, Axel (2003). "Are all fishes ancient polyploids?". Journal of Structural and Functional Genomics. 3 (1–4): 65–73. doi:10.1023/A:1022652814749. PMID 12836686.  Van De Peer, Yves (2004). "Tetraodon genome confirms Takifugu findings: Most fish are ancient polyploids". Genome Biology. 5 (12): 250. doi:10.1186/gb-2004-5-12-250. PMC 545788 . PMID 15575976.  Van de Peer, Y.; Meyer, A. (2005). "Large-scale gene and ancient genome duplications". In Gregory, T.R. The Evolution of the Genome. San Diego: Elsevier. pp. 329–68.  Wolfe, Kenneth H.; Shields, Denis C. (1997). "Molecular evidence for an ancient duplication of the entire yeast genome". Nature. 387 (6634): 708–13. doi:10.1038/42711. PMID 9192896.  Wolfe, Kenneth H. (2001). "Yesterday's polyploids and the mystery of diploidization". Nature Reviews Genetics. 2 (5): 333–41. doi:10.1038/35072009. PMID 11331899. 

External links[edit] Polyploidy on Kimball's Biology Pages The polyploidy portal a community-editable project with information, research, education, and a bibliography about polyploidy. v t e Cytogenetics: chromosomes Basic concepts Karyotype Ploidy Genetic material/Genome Chromatin Euchromatin Heterochromatin Chromosome Chromatid Nucleosome Nuclear organization Types Autosome/Sex chromosome (or allosome or heterosome) Macrochromosome/Microchromosome Circular chromosome/Linear chromosome Extra chromosome (or accessory chromosome) Supernumerary chromosome A chromosome/B chromosome Lampbrush chromosome Polytene chromosome Dinoflagellate chromosomes Homologous chromosome Isochromosome Satellite chromosome Centromere position Metacentric Submetacentric Telocentric Acrocentric Holocentric Centromere number Acentric Monocentric Dicentric Polycentric Processes and evolution Mitosis Meiosis Structural alterations Chromosomal inversion Chromosomal translocation Numerical alterations Aneuploidy Euploidy Polyploidy Paleopolyploidy Polyploidization Structures Telomere: Telomere-binding protein (TINF2) Protamine Histone H1 H2A H2B H3 H4 Centromere A B C1 C2 E F H I J K M N O P Q T See also Extrachromosomal DNA Plasmid List of organisms by chromosome count List of chromosome lengths for various organisms List of sequenced genomes International System for Human Cytogenetic Nomenclature v t e Speciation Basic concepts Species Species problem Reproductive isolation Chronospecies Anagenesis Cladogenesis Modes of speciation Allopatric Peripatric (Founder effect) Parapatric (Cline) Sympatric (Heteropatric) Ecological speciation Hybrid speciation Auxiliary mechanisms Adaptation Assortative mating Reinforcement Selection Sexual selection Paleopolyploidy Polyploidy Punctuated equilibrium Intermediate stages Hybrid Species complex Ring species Haldane's rule Retrieved from "" Categories: Classical geneticsSpeciationHidden categories: Wikipedia articles needing page number citations from September 2013All articles with unsourced statementsArticles with unsourced statements from August 2013Articles with unsourced statements from November 2009Articles with unsourced statements from December 2010CS1 maint: Multiple names: authors list

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