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Ernst Mayr, for whom, species and species problem have been the main concern of research, points out that speciation, the multiplication of species, that is division of one parent species into several daughter species is one process responsible for the evolutionary diversity of organic world. Darwin no where in his book Origin of Species defined the word species precisely although he interpreted speciation in terrns of reproductive isolation (Darwin again did not use the term reproductive isolation in his book.) Darwin did en~phasise that occupation of an unique ecological niche by each species could be a major characteristic of speciation. In this unit we shall briefly analyse the species concept laying emphasis on biological species and discuss in detail different types of mechanisms of speciation. Further we shall briefly look into how isolation brings about genetic repatterning and proceed to discuss the mechanisms of isolation with well chosen examples. As an illustration of how isolating mechanisms develop gradually, we shall explain the concept of ring species - the evolution of distinct new species. Finally there will also be a discussion on a phenomenon called genetic drift which however has no causal connection with speciation process but explains that in peripheral isolates gene frequencies drift due smapling error.
Name two possible why the number of live bacteria cell have reached the stationary growth by 60hrs and start to die off after 12hrs?
Receptors are sense organs that receive stimuli. On the basis of their location in body receptors are of following types - 1 . Extero receptor - Located at or near t
Define the Recommended Dietary Allowance for Vitamin B 12 (RDA)? Vitamin B 12 deficiency is common in true vegans who can be treated with small doses since the daily requirem
Explain Non-surgical Endodontic Retreatment - Missed Canal Missed root canal as it hold pulp tissues and bacteria is major cause of endodontic failure. Mandibular molar
Q. Can you explain Right Ventricle Enlargement? The right ventricle (RV) is roughly triangular in shape on the PA view, with a near vertical base - apex axis. When this chamber
Advantages Durability of these vales are long lasting. Disadvantages Need for anticoagulant therapy is life long. Risk of thrombo-embolism is hi
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What is Radioactivity ? Radioactivity : Some isotopes, called radioisotopes, have unstable nuclei that release high energy particles or radiant energy, or both. An example
Q. How does photosensitivity in annelids, cnidarians and worms differ from insects, cephalopods and vertebrates? In the first mentioned group of animals there are photoreceptor
Would you expect the muscle fibers of the tongue to be striated or smooth? What about the muscle of the diaphragm/ Explain your answer.
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