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In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance among biologists. In this section we shall proceed to discuss the mechanisms of speciation or the mode of formation of a species. Mayr's definition of species amply makes it clear that to qualify for the title of the species, the individuals must be reproductively isolated from other groups. This naturally raises a question whether a new species could arise from populations occupying the same territory. In other words, should the populations of parent species live in quite separate territories in the formation of new species? In our earlier discussions. on natural selection, you have learnt that originmof adaptations is a gradual process, This is much more true of speciation. Biologists recognise three different kinds of speciation.
Define the effect of dietary fibre on Nutrient Absorption? Nutrient Absorption: Inclusion of fibre has been shown to retard the absorption of some nutrients. The inclusion of v
Width of the Implant The width of the implant especially at the interface area is critical towards the success of the implant. It has been recommended that at least 1mm of bone
whats polymorphic
Q. Why does not a long lasting vaccine against common cold exist yet? Viruses that present a high mutation rate like the virus that causes the common cold escape easily from th
CEL L THEORY Proposed by Mathias Jacob Schleiden, 1838 (Jerman Botanist), Theodore Schwann, 1839 (Jerman Zoologist) It consists of 5 fundamental facts - (i) Body of livi
TECHNIQUE OF ASSESSMENT OF GROWTH AND DEVELOPMENT Measurement of physical growth in children is a key element in evaluation of the health status of children. Physical grow
Explain risk factor at the global perspective in heart diease? While the risk of Cardio-vascular diseases has been found to be variable in different ethnic groups with the high
Q. What is Osseointegration in macroscopic biomechanical? A fixture is osseointegrated if there is no progressive relative motion between the fixture and surrounding living bon
Based on the scientific name. Streptococcus agalactiae what morphology would you expect these cells to have?
Define the Prevention of iron deficiency anaemia? As in the case of vitamin A deficiency, correction and prevention of dietary inadequacy of iron are important sustainable meth
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