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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.
Counselling a diabetic patient and their family members is very important as patient has to modify the life style and diet and needs family support. Therefore it is important for y
Explain about the Maurice Theory according to corneal transparency. Maurice Theory: The uniform collagen fibrils are arranged in regular lattice pattern separated b
how can we make an assignment for the subject alimentary canal
Give ditail account on regernation in invertebrates and vertabrites
Infective Endocarditis It is an infection of the endocardial surface with micro organisms present in the lesion. The endocardium is contagions with the valves of the heart.
What is the curvature of the lens In a human being and most other mammals, the first three mechanisms are not possible and accommodation occurs by the fourth mechanism only. T
What is the difference between xylem and phloem? Both xylem and phloem are vascular tissues found in a plant. Xylem is a tubular structure, which is liable for water transport
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Which is the cell organelle that is specialized in aerobic respiration? The cell organelles that are specialized in aerobic respiration are the mitochondria. Cell Respiratio
Why is sub-culturing essential in plant tissue culture? Explain the process of heterosis. How is it dissimilar from inbreeding depression? Where and how is urea produced in
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