Dec. 12, 2012 ? The study of chromosome changes arisen during species evolution is a current and intriguing topic that evolutionary biology proposes. However, in several groups (for example, molluscs), and chitons in particular, chromosome studies are scarce, with a few species investigated and analyses performed mostly with simple methods.
Only 2,5% of about 900 living species of chitons have been so far karyologically investigated, all of them in the same order (Chitonida). The authors note that the species of suborder Chitonina all have a karyotype of 2n=24 chromosomes, all biarmed, that is metacentric or submetacentric. The species studied by the authors, formerly included in Chitonida, also possesses 2n=24 elements, but many are uniarmed and, therefore, resembling to the chromosome complement of species of the suborder Acanthochitonina. This provides support to recent attribution of the studied sea cradle to the latter suborder.
Furthermore, the comparison among the karyotypes of the suborder Acanthochitonina allows the authors to propose that in this group of chromosome changes mainly occurred by fusion among uniarmed elements. This kind of change is that mainly involved in chromosome animal evolution. The study was published in the open access journal Comparative Cytogenetics.
Share this story on Facebook, Twitter, and Google:
Other social bookmarking and sharing tools:
Story Source:
The above story is reprinted from materials provided by Pensoft Publishers, via EurekAlert!, a service of AAAS.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.
Journal Reference:
- Petraccioli A, Maio N, Odierna G. Chromosomes of Lepidochitona caprearum (Scacchi, 1836) (Polyplacophora, Acanthochitonina, Tonicellidae) provide insights into Acanthochitonina karyological evolution. Comparative Cytogenetics, 6(4): 397 DOI: 10.3897/CompCytogen.v6i4.3722
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.
Source: http://feeds.sciencedaily.com/~r/sciencedaily/~3/Rv9QRMkiTfY/121212111327.htm
49ers mike brown earthquake bcs rankings world war z When Is Veterans Day 2012 brooke burke
কোন মন্তব্য নেই:
একটি মন্তব্য পোস্ট করুন