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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.
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what are the sources of infection (human, animal and non-living reservoirs), the routes of transmission (way in which the infection spreads) and different ways in which micro-organ
what should i write in conclusion
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by our eyes we can see the beautiful world but is there anything in our eyes which makes it beauiful??
Define the Spray Drying Method? Spray drying is a unique drying process since it involves both particle formation and drying. It is most suitable for drying of liquid foods suc
What is reproduction?
Theoretical Foundation of Halsted Reitan battery There are really two theoretical bases for the Halsted Reitan battery, one contained in brain and intelligence and related writ
Explain about the Anti Obesity Drugs? The anti-obesity drugs can be classified into two broad groups as indicated in the Figure. Drugs must be taken only under Doctor's
Explain the Cost Benefit Analysis? Cost-benefit analysis: Cost benefit analysis is a useful tool to establish the priority of a particular health service action. In this, both
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