Cytogenetics of Polyploids
نویسندگان
چکیده
منابع مشابه
Cytogenetics of Polyploids III. Dauermodifications in Ageratum conyzoides Linn
The term "dauermodifications' was coined by Jollos in 1913 and he described it as a change induced externally by an experimental means at a definite moment (Jollos 1921). Sonneborn (1950) regarded dauermodifications as the traits induced by environmental conditions, manifesting temporary cytoplasmic inheritance. Hence, after some period, under the original conditions, the induced traits disappe...
متن کاملEVOLUTION OF POLYPLOIDS Reference: Harlan and deWet (1975) Origins of Polyploids Literatures relating to evolution of polyploids
Class I: Chromosome increase occurs in the first generation through the union of gametes one or both of which are unreduced. Can occur following selfor crosspollination. Class II: Chromosome doubling occurs in offspring of a hybrid with meiotic disturbances leading to unreduced gametes. It’s a second generation phenomenon: F2, BC1 or F1 crossed to a third parent. Class III: Chromosomal doubling...
متن کاملPolyploids, genome halving and phylogeny
MOTIVATION Autopolyploidization and allopolyploidization events multiply the number of chromosomes and genomic content. Genome rearrangement phylogenetics requires that all genomes analyzed have the same set of orthologs, so that it is not possible to include diploid and polyploid genomes in the same phylogeny. RESULTS We propose a framework for solving this difficulty by integrating the rear...
متن کاملGenomic change and gene silencing in polyploids.
Combining the genomes of two species through hybridization and chromosome doubling can create a new allopolyploid species virtually overnight. Although common in Nature, such genetic mergers might not be easy. Recent studies, mostly in plants, suggest that polyploidization can induce a flurry of genetic and epigenetic events that include DNA sequence elimination and gene silencing. Without warn...
متن کاملLessons from Natural versus Experimentally Induced Polyploids
The loach (Misgurnus anguillicaudatus) is an excellent animal model to elucidate biological origin and evolutionary significance of genome duplication and unisexual reproduction because artificially induced and naturally occurring polyploids and parthenogenetic (gynogenetic, androgenetic) animals can be compared. First, we summarize the chromosome manipulation techniques to induce triploids and...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1965
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.30.1