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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Chemotaxonomy: Introduction and Primary Metabolites

Plant Chemotaxonomy is one of the more fashionable and rapidly extending areas of plant taxonomy that seeks to utilize chemical information to improve classification of plants.It has many diverse and indeed ancient origins. 1. The foremost comes the search by Herbalists, and latterly by pharmacists, for drugs, which has involved …

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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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Views on Species Concept

Species is the basic & smallest whit of classification which is represented by binomial nomenclature according to ICBN. Two individuals with maximum similarities which can interbred among themselves & produce fertile individual & also can exchange gene are called Species. A Species concept is a concept that is the production …

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IUCN Red List Categories

Established in 1964, The International Union for Conservation of Nature’s Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species. The IUCN Red List is a critical indicator of the health of the world’s biodiversity. Far …

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Division II: Rules and Recommendation

Melbourne Code Division II: Rules and Recommendation Chapter II: STATUS, TYPIFICATION, AND PRIORITY OF NAMES Section I: Status Definitions Article 6 (*Some articles are cropped to avoid more detailed info unnecessary in our level. If you wish, you can read the full code from the link here: Melbourne Code)  6.1.  Effective …

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Division I: Principles of ICN

DIVISION I PRINCIPLES PRINCIPLE I The nomenclature of algae, fungi, and plants is independent of zoological and prokaryotic nomenclature. This Code applies equally to names of taxonomic groups treated as algae, fungi, or plants, whether or not these groups were originally so treated. PRINCIPLE II The application of names of taxonomic …

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Cytotaxonomy: Study of Chromosome Behaviour

Chromosome behavious 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 I, bivalents by II, etc. Some taxonomic information can be gained from the study of mechanism …

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Cytotaxonomy: Study of Chromosome Structure

Study of chromosome structure is very important in cytotaxonomic studies. It includes chromosome size, shape and position of centromere (i.e. arm-length ratio of each chromosome in the genome) Chromosomal size and shape are also important as taxonomic criteria in taxonomy. For examples, The chromosomal ratio if Mediola and Trillium of …

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