Constraints upon the organisation and evolution of chromosomes in Allium View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1988-01

AUTHORS

R. K. J. Narayan

ABSTRACT

In terms of chromosome morphology, karyotype organisation, taxonomy and genetic relationship as judged from chromosome pairing in the Fl hybrid, A. cepa and A.fistulosum are two closely related species. But large variation in nuclear DNA amounts has occurred during the evolution of the two species. A comparison of the molecular composition of DNA in the two species has confirmed that the excess DNA acquired during evolution was predominantly repetitive sequences (sequences which do not encode genetic information). However, its distribution within the chromosome complements was equal in all chromosomes irrespective of the differences in chromosome size. The even distribution of the excess DNA within complements suggests strong constraints underlying evolutionary changes in genome organisation. The nature of the constraints is discussed, and it is shown that such constraints can influence the direction of karyotype evolution during speciation. More... »

PAGES

319-329

Journal

TITLE

Theoretical and Applied Genetics

ISSUE

2

VOLUME

75

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00303971

DOI

http://dx.doi.org/10.1007/bf00303971

DIMENSIONS

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