نتایج جستجو برای: cytotype
تعداد نتایج: 241 فیلتر نتایج به سال:
Genome duplication in plants is thought to be a route speciation due cytotype incompatibility. However, reduce cross-pollination between cytotypes animal-pollinated species, distinctive floral phenotypes, which would allow pollinator-mediated assortative mating flowers, are also expected. Chamerion angustifolium Holarctic species that forms hybrid zone diploid and tetraploid populations the Nor...
Diploid clones of the hybrid acacia (Acacia mangium × A. auriculiformis) are widely planted in Vietnam because their high productivity, adaptability, and commercial wood yields. Polyploid breeding offers possibilities for further enhancing vigor generating new value genotypes. In a field trial, we compared three diploid with respective colchicine-induced tetraploid lines. Flowering seed product...
Coelomocytes is the generic name for a collection of cellular morphotypes, present in many coelomate animals, and highly variable among echinoderm classes. The roles attributed to major types these free circulating cells coelomic fluid echinoderms include immune response, phagocytic digestion clotting. Our main aim this study was characterize coelomocytes found Marthasterias glacialis (class As...
Indole ahloids of Vinca species are valued greatly in medical sciences, one reason being for their use as powerful anticancer agents. There are four species of Vinca in Iran: V. rosea, V. major, V. minor and V. herbacea. In previous investigations, we found that these plants have considerable alkaloid similarity (58.8- 75%). Therefore, chromosomic and electrophuretic studies followed after i...
the highly conserved morphology and chromosomal structures of house mouse, mus musculus, provides a good model for chromosomal studies. sex-autosome translocations is one of the rarest chromosomal rearrangements among mammals and therefore sex-autosome translocations has been offered as accurate taxonomic markers to identify species with similar morphological traits. in this study, we described...
Polyploidy is an example of instantaneous speciation when it involves the formation of a new cytotype that is incompatible with the parental species. Because new polyploid individuals are likely to be rare, establishment of a new species is unlikely unless polyploids are able to reproduce through self-fertilization (selfing), or asexually. Conversely, selfing (or asexuality) makes it possible f...
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