Chromosomal divergence and speciation in grasshoppers

Hewitt, Godfrey M.

doi:10.1007/978-94-011-1510-0_9

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2000

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“…The array of factors that have been implicated in chromosomal evolution range from the population to the molecular level (e.g. White 1973;Redi et al 1990;Wichman et al 1991;Hewitt 1993;King 1993;Sites & Reed 1994;Ladeve© ze et al 1998). Karyotype evolution is governed by the availability of new chromosomal rearrangements, their impact on the organism, their constraints on meiosis producing balanced gametes and the population structure.…”

Section: Discussionmentioning

confidence: 99%

Chromosome fission associated with growth of ribosomal DNA in Neodiprion abietis (Hymenoptera: Diprionidae)

Rousselet

Monti

Auger‐Rozenberg³

et al. 2000

Proc. R. Soc. Lond. B

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The haploid complement consists of seven metacentric chromosomes in most diprionid species but has evolved to n = 8 by fission in Neodiprion abietis. This fission generated a small telocentric chromosome and a large pseudoacrocentric chromosome with a short arm carrying a satellite. In situ hybridization indicated that the location of the rRNA gene cluster corresponds to the whole short arm. This suggests that (i) the breaking point was located close to an rRNA gene cluster, and (ii) fission was associated with growth of rDNA. These results suggest rDNA as a preferential breaking point but with a role in the healing of naked chromosome ends.

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Section: Discussionmentioning

confidence: 99%