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autopolyploid |
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autopolyploid
[ô′tōpol′iploid] Etymology: Gk, autos + polyploos, many times, eidos form 1 an individual, organism, strain, or cell that has more than two genetically identical or nearly identical sets of chromosomes that are derived from the same ancestral species. They result from the duplication of the haploid chromosome set and are referred to as autotriploid, autotetraploid, autopentaploid, autohexaploid, and so on, depending on the number of multiples of the haploid chromosomes they contain. Also called autopolyploidic. autopolyploidy, n. 2 pertaining to such an individual, organism, strain, or cell. Compare allopolyploid. See also allodiploid. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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However, this study, which suggests speciation associated with autopolyploid changes in chromosome number, is based on mitotic counts, which are notoriously difficult to interpret in Carex except in species with the lowest numbers. In autopolyploids, although the diversity of genetic potential increases by the development of new alleles, as has been shown in Tolmiea menziesii (Soltis & Rieseberg, 1986) and in Dactylis glomerata (Lum aret & Barrientos, 1990), an autopolyploid has very little chance of becoming established because multivalents form during meiosis, causing partial sterility. Olah and DeFilipps (1968) concluded that this species is a polyhaploid derived from the autopolyploid D. |
autopolyploid |
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