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Q. Phylogenetic species concept ?
Taxonomists (scientists who compare, classify and name organisms) tend to describe a species by studying their physical characteristics and behaviour, and also their genetic and chemical similarities and divergences as a result of evolution. Based on this concept Cracraft proposed the Phylogenetic Species Concept (PSC) in 1983. Here he defines a species as "the smallest diagnostic cluster of individual organisms within which there is parental pattern of ancestry and decent." However, it can be argued that a population, subspecies, stage or a morph can then be elevated to species status. Consequently the number of species recognised becomes highly dependant on the analytical tools used. Even so, the PSC is considered as the most valuable tool for working taxonomists.
Mitral valve prolapse (MVP) has emerged as a prominent, predisposing structural cardiac abnormality and in adults accounts for 7 to 30 per cent of NVE in cases not related to drug
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Tracheostomy Care A tracheostomy is an external opening made into the trachea in order to provide an artificial airway (an opening is made in the 2nd and 3rd or 4th trach
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DIVISION PHASE OR MITOSIS (M- PHASE) Cell division was first observed by Naegeli 1842 in plant cells ,but thoroughly described by Eduard strasburger 1875. Fleming 1879 desc
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Q. Which are the heart chambers respectively where the entrance and the exit of blood occur? The heart chambers through which blood enters the heart are the atria there are the
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Polyembryony Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable
Define the term - lamellac The inner membrane is folded into very closely packed membranes called the lamellac. The lamellae flatten out at regular intervals into structures c
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