منابع مشابه
Complex cytogeographical patterns reveal a dynamic tetraploid–octoploid contact zone
The distribution of cytotypes in mixed-ploidy species is crucial for evaluating ecological processes involved in the establishment and evolution of polyploid taxa. Here, we use flow cytometry and chromosome counts to explore cytotype diversity and distributions within a tetraploid-octoploid contact zone. We then use niche modelling and ploidy seed screening to assess the roles of niche differen...
متن کاملEvolution of nociception in vertebrates: comparative analysis of lower vertebrates.
Nociception is an important sensory system of major fundamental and clinical relevance. The nociceptive system of higher vertebrates is well studied with a wealth of information about nociceptor properties, involvement of the central nervous system and the in vivo responses to a noxious experience are already characterised. However, relatively little is known about nociception in lower vertebra...
متن کاملComparative genetic mapping between octoploid and diploid Fragaria species reveals a high level of colinearity between their genomes and the essentially disomic behavior of the cultivated octoploid strawberry.
Macrosynteny and colinearity between Fragaria (strawberry) species showing extreme levels of ploidy have been studied through comparative genetic mapping between the octoploid cultivated strawberry (F. xananassa) and its diploid relatives. A comprehensive map of the octoploid strawberry, in which almost all linkage groups are ranged into the seven expected homoeologous groups was obtained, thus...
متن کاملHematology of Lower Vertebrates
Introduction The proper evaluation of the hemogram of any animal patient involves the determination of a total erythrocyte count [TRBC], packed cell volume [PCV], hemoglobin concentration [Hb], total white blood cell count [TWBC], white blood cell differential, and the evaluation of a stained peripheral blood film. The basic techniques used in mammalian hematology also apply to that of lower ve...
متن کاملHead segmentation in vertebrates
Classic theories of vertebrate head segmentation clearly exemplify the idealistic nature of comparative embryology prior to the 20th century. Comparative embryology aimed at recognizing the basic, primary structure that is shared by all vertebrates, either as an archetype or an ancestral developmental pattern. Modern evolutionary developmental (Evo-Devo) studies are also based on comparison, an...
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ژورنال
عنوان ژورنال: Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences
سال: 2002
ISSN: 0962-8436,1471-2970
DOI: 10.1098/rstb.2001.1035