The population cytogenetics of Crepis capillaris I. Chiasma variation
نویسندگان
چکیده
منابع مشابه
Influence of the Presence of B Chromosomes on DNA Damage in Crepis capillaris
The sensitivity of different plant species to mutagenic agents is related to the DNA content and organization of the chromatin, which have been described in ABCW and bodyguard hypotheses, respectively. Plant species that have B chromosomes are good models for the study of these hypotheses. This study presents an analysis of the correlation between the occurrence of B chromosomes and the DNA dam...
متن کاملThree-dimensional organization of chromosomes of Crepis capillaris by optical tomography.
The three-dimensional (3D) organization of chromosomes of Crepis capillaris (2n = 6) has been investigated. Root tips were fixed, macerated with enzymes and gently separated without squashing. The cells were then stained with DAPI and optically sectioned under computer control. Sections were stored as video images and processed to remove noise and out-of-focus information. Computer modelling wa...
متن کاملVariable content of a (GC) rich satellite DNA in tumorous and normal cultures of Crepis capillaris.
Analyses of DNA from tumorous and non tumorous cultures of Crepis capillaris by analytical equilibrium centrifugation in a neutral CsCl gradient revealed significant differences in regard to the content of a heavy component satellite, which was more highly represented in tumorous cultures. DNA of plant leaves showed a unimodal distribution of molecules. The choice of suitable controls served to...
متن کاملMolecular evidence for transcription of genes on a B chromosome in Crepis capillaris.
Dispensable, supernumerary (B) chromosomes are found in diverse eukaryotic species. The origin and genetic consequences of B chromosomes have been the subjects of speculation for more than a century. Until now, there has been no molecular evidence that B chromosome DNA is transcribed and there is no unequivocal evidence as to their origin. B chromosomes are considered to be genetically inert al...
متن کاملThe Relation of Oxygen Posttreatment and Heterochromatin to X-Ray-Induced Chromosome Aberration Frequencies in Crepis Capillaris.
EVERAL studies have now demonstrated that postirradiation oxygen treatS ments can markedly increase the initial X-ray damage in barley seeds (ADAMS, NILAN AND GUNTHARDT 1955; NILAN 1955; ADAMS AND NILAN 1958; CALDECOTT et al. 1957; CURTIS, CALDECOTT AND KONZAK 1957). One of the more striking of these after effects is the marked increase in the frequencies of chromosome aberrations (ADAMS, NILAN...
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ژورنال
عنوان ژورنال: Heredity
سال: 1981
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1981.62