منابع مشابه
Intraspecific nuclear DNA variation in Drosophila.
We have summarized and analyzed all available nuclear DNA sequence polymorphism studies for three species of Drosophila, D. melanogaster (24 loci), D. simulans (12 loci), and D. pseudoobscura (5 loci). Our major findings are: (1) The average nucleotide heterozygosity ranges from about 0.4% to 2% depending upon species and function of the region, i.e., coding or noncoding. (2) Compared to D. sim...
متن کاملkaryological and nuclear dna content variation in some iranian endemic thymus species (lamiaceae)
thymus is a medicinal plant which contains one of the world's top ten essential oils, exhibiting antibacterial, antioxidative, food preservative and mammalian age-delaying properties. this work was aimed at identifying between-species variations requiring for selecting appropriate parents for hybridization. six iranian endemic thymus accessions belonging to thymus daënensis, t. eriocalyx and t....
متن کاملPatterns of intraspecific DNA variation in the Daphnia nuclear genome.
Understanding nucleotide variation in natural populations has been a subject of great interest for decades. However, many taxonomic groups, especially those with atypical life history attributes remain unstudied, and Drosophila is the only arthropod genus for which DNA polymorphism data are presently abundant. As a result of the recent release of the complete genome sequence and a wide variety ...
متن کاملPhylogeny and New Intrageneric Classification of Allium (Alliaceae) Based on Nuclear Ribosomal DNA ITS Sequences
The internal transcribed spacer region (ITS) of nuclear ribosomal DNA was sequenced from 195 representative species of Allium, two species of Nothoscordum, and one species each of lpheion, Dichelostemma, and Tulbaghia. Within the Allium species the lengths of the ITS regions were in a range from 612 to 661 base pairs and pairwise genetic distances reached up to 46%. The ITS data supported the i...
متن کاملNuclear DNA content variation among Central European Koeleria taxa.
BACKGROUND AND AIMS Polyploidization plays an important role in the evolution of many plant genera, including Koeleria. The knowledge of ploidy, chromosome number and genome size may enable correct taxonomic treatment when other features are insufficient as in Koeleria. Therefore, these characteristics and their variability were determined for populations of six central European Koeleria taxa. ...
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ژورنال
عنوان ژورنال: Heredity
سال: 1968
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1968.76