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Meiosis and Its Deviations in Polyploid Animals
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet). (Per Stenberg, Computational Life Science Cluster (CLiC))
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet).
2013 (Engelska)Ingår i: Cytogenetic and Genome Research, ISSN 1424-8581, E-ISSN 1424-859X, Vol. 140, nr 2-4, s. 185-203Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We review the different modes of meiosis and its deviations encountered in polyploid animals. Bisexual reproduction involving normal meiosis occurs in some allopolyploid frogs with variable degrees of polyploidy. Aberrant modes of bisexual reproduction include gynogenesis, where a sperm stimulates the egg to develop. The sperm may enter the egg but there is no fertilization and syngamy. In hybridogenesis, a genome is eliminated to produce haploid or diploid eggs or sperm. Ploidy can be elevated by fertilization with a haploid sperm in meiotic hybridogenesis, which elevates the ploidy of hybrid offspring such that they produce diploid gametes. Polyploids are then produced in the next generation. In kleptogenesis, females acquire full or partial genomes from their partners. In pre-equalizing hybrid meiosis, one genome is transmitted in the Mendelian fashion, while the other is transmitted clonally. Parthenogenetic animals have a very wide range of mechanisms for restoring or maintaining the mother's ploidy level, including gamete duplication, terminal fusion, central fusion, fusion of the first polar nucleus with the product of the first division, and premeiotic duplication followed by a normal meiosis. In apomictic parthenogenesis, meiosis is replaced by what is effectively mitotic cell division. The above modes have different evolutionary consequences, which are discussed. See also the sister article by Grandont et al. in this themed issue.

Ort, förlag, år, upplaga, sidor
2013. Vol. 140, nr 2-4, s. 185-203
Nyckelord [en]
Gynogenesis, Hybridogenesis, Kleptogenesis, Parthenogenesis
Nationell ämneskategori
Cell- och molekylärbiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-79922DOI: 10.1159/000351731ISI: 000322770900008OAI: oai:DiVA.org:umu-79922DiVA, id: diva2:645317
Tillgänglig från: 2013-09-04 Skapad: 2013-09-04 Senast uppdaterad: 2018-06-08Bibliografiskt granskad

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Stenberg, PerSaura, Anssi

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Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet)
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Cytogenetic and Genome Research
Cell- och molekylärbiologi

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