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Phenetic ClassificationThis system is based exclusively upon face value of observed characters without direct reference to phylogeny. The taxa are either classified on the basis of a few characters or overall characteristics. When based on a few characters, the groupings are subjected to change on the discovery of natural affinities of the taxa,The greatest weakness in phenetic approach is that it demonstrates a false claim in establishing natural groups as products of the human mind rather than of evolution. It is now a well recognised fact for all natural taxa, especially species with their 'reproductive isolation, that they are not an arbitrary, subjective, man-made phenomena. This approach is quite useful for groups with immature classification and to those with numerous non-redundant characters. It is of no use when applied to higher organisms. The use of computer methods of pheneticists can be of great help in taxonomy if combined with philosophy of evolutionary taxonomy together with a the proper weighting of characters.
A scientist wanted to study the effect of a drug on the blood pressure of rats. She set up an experiment in which the experimental group consisted of rats that were injected with a
As heart failure sets in, there is activation of RAS (Fig 2.1). Adrenergic stimulation of beta-1 receptors in juxtaglomerular apparatus of the kidneys results in release of renin.
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explain the role of cyclic photophosphorylation in photosynthesis
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Define lipids 'lipids' defines substances as oils, fats and waxes which can be only characterized by a large array of properties. They are in general: - coming from plant
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