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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.
Illustrate about Whey protein Whey protein concentrate (WPC) is a highly nutritious ingredient manufactured from fresh dairy whey and it is spray dried to provide an excellent
What are the plant hormones? The Plant hormones also called as phytohormones, are the substances that control the embryonic development and the growth of the adult plant.
- Nuclear membrane disorganize at the beginning of this phase. - Spindle fibers originate and the kinetochore fibers attach to the kinetochore of homologous chromosomes from eac
Explain about the Prebiotics? Ingredients/compounds that have a beneficial effect on microflora in the large intestine of the host e.g. fibre, fructo oligosaccharides, lactulos
Determine the term Poliomyelitis - Brian diseases Poliomyelitis is an acute infectious disease caused by a virus that has a special affinity for the motor neurons of the spinal
What is the valve that separates the stomach from the esophagus called? What is its function? The valve that separates the stomach from the esophagus is the cardia. It has the
What key idea, contained in Malthus's essay on populations, helped Darwin formulate his theory of natural selection?
State the Versions of Binocular movements Versions are movements of both eyes in the same direction. a) Dextroversions: Movements of both eyes to'the right side. b) Levov
What is sodium-potassium pump ATPase? A. There is a net flux of sodium from intracellular spaces into luminal spaces through sodium-potassium pump ATPase spanning proteins l
what is test cross?
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