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Evolutionary Classification
Evolutionary classification combines aspects of both phenetic and cladistic systematic. Evolutionary taxonomists attempt to show in their classification both the evolutionary relationships and the degrees of similarity among organisms. It is impossible, however, to represent both similarities and genealogies accurately in a single classification system because rates of evolution among groups of organisms and among different traits within groups of organisms are often highly variable. Therefore, evolutionary taxonomists must compromise between their 'two goals. This need not be confusing as long as the nature of the compromise is clearly indicated so that users of the system know how the taxonomic categories were constructed. With a simple and hypothetical example we can illustrate how different approaches lead to different classification of organisms even when they use the same data. Six characters have been measured, and each one can have either the ancestral state (0) or a derived one (1). In this example, evolutionary reversal of character states are: not found but in real life some reversals may occur. Given these character states, we can compare the four species phenetically and cladistically. The phenetic similarity calculation is based on the number of shared characteristics that are in the derived
Post-operative Care The goals of care during post-operative period include: Prevent the baby from sucking and crying to avoid tension on suture line. Give proper p
Q. Drug Management for gout disease? Drugs are so effective in lowering the serum mate concentration that rigid restriction of dietary purines is rarely necessary. Uricosurie d
Scope of zoology
Determine about the scales developed by golden Several other scales have been developed by Golden and various collaborators, all of which are based on different ways of scoring
Extraradicular Infections Whatever the cause of post endodontic disease we should do proper diagnosis to determine what is the cause; is it intra or extraradicular infection ,
Hormone s . The thyroid gland secretes following hormones. Thyroxine (tetraiodothyronine or T 4 )' and tri-iodothyronine or T 3 are secreted by the thyroid follicular cells.
Briefly Explain about the Chromium? As you will go through this section, you will realize that compared to other minerals, the essentiality of chromium was recognized very late
Major role in contributing towards motivation. Psychological factors: Depression, anxiety or phobia induced by illness, life- style changes or medication effects, may hinder
Q. Is the stage when an insect larva is within a cocoon a stage of total biological inactivity? The period when the larva is inside its cocoon is a time of intense biological a
Discuss the similarities and differences of transposable elements in E. coli, yeast, plants, and Drosophila.
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