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Tag Archives: Contemporary Systematics

Chemotaxonomy: Semantides

Semantides are information-carrying molecules. Semantides provide taxonomic data not on the basis of presence or absence, but in terms of sequences, ratios or percentages,. Semantides are of three types, viz., Primary semantide – DNA Secondary semantide- RNA Tertiary semantides – Proteins Sometimes the semantides together with the larger polysachharides, are …

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Chemotaxonomy: Secondary Metabolites

The chemical substances which have been found very useful in taxonomy are secondary metabolites. Secondary metabolites (secondary plant products) perform non-vital (or at least non- universally vital) functions, and are less widespread in plants. The restricted occurrence of these metabolites among plants renders them valuable as taxonomic information. Secondary plant …

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Biosystematics: Steps and Categories

The steps in biosystematic investigation are as follows Sampling of taxon and its population and cytological study of the chromosome of many population within geographical races, species and genera; differences in chromosome number, their morphology, behavior of meiosis indicated genetic differences. Determination of ability of the different population to hybridize …

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Cytotaxonomy: Study of Chromosome Behaviour

Chromosome behaviour is an important factor that determine the pattern of variation and taxonomic distinctness. Pairing behavior and subsequent separation of chromosome occurs at meiosis. In reporting results of pairing studies, univalents are represented by Is, bivalents by IIs, etc. Some taxonomic information can be gained from the study of …

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