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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.
Explain Food Effects on Drug Excretion? Food and nutrients can alter the re-absorption of drugs from the renal tubes. Urinary acidity affects drug re-absorption from the renal
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After Purchasing The following points should be considered for after purchase facilities. Avail of any training the software engineer or vendor may provide, even if it
How mechanical soft diet is a normal diet The mechanical soft diet is a normal diet that is modified only in texture for ease of mastication. This is used when a patient canno
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Do plants placed under an environment drier than the habitat where they are used to living have a reduction or an increase in the time during which their stomata remain open? I
Natality Rate - Natality Natality rate or birth rate is determined by dividing the number of individuals born by unit time and is expressed as follows: Natality rate = ΔNn
What is Obesity in biochemical or physiological risk ? Obesity results from a complex interaction of genetic predisposition and environmental factors operating throughout an in
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