منابع مشابه
Evolution of Invasive Populations
Evolutionary mechanisms that operate at multiple stages of invasions (e.g., transport, introduction, establishment) could profoundly affect the invasive success of populations. Evolution within the native range shapes the intrinsic properties of populations (e.g., plasticity, evolvability) in a manner that would dictate their response to novel environments. Confronted with a sudden introduction...
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Theories of evolution . Variation of gene frequency . Simple Mendelian equilibrium . Mutation pressure . Migration pressure . Selection pressure . Equilibrium under selection . Multiple allelomorphs . Random variation of gene frequency . Rate of decrease in heterozygosis . The population number . The distribution of gene frequencies and its immediate consequences . No mutation, migration or sel...
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abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولKaryotypic Study and Chromosome Evolution in Some Iranian Local Onion Populations
Abstract A karyotypic study was performed on 12 Iranian local onion (Allium cepa L.) populations. A number of mitotic cells at metaphase stage for each population were prepared. Chromosomes of suitable mitotic cells were counted and various parameters, including long arm (L), short arm (S), total length of chromosome (TL), relative length of chromosome (RL), arm ratio (AR), r-value, total chro...
متن کاملExperimental evolution in biofilm populations
Biofilms are a major form of microbial life in which cells form dense surface associated communities that can persist for many generations. The long-life of biofilm communities means that they can be strongly shaped by evolutionary processes. Here, we review the experimental study of evolution in biofilm communities. We first provide an overview of the different experimental models used to stud...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/251556a0