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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.
Q. What are the types of chronic gastritis? Gastroscopic observation shows different types of chronic gastritis: 1. Superficial gastritis: gastric mucosa is red, oedematous,
brief account on classification and general characters of protozoa
Explain congenital heart disease ? No systematic surveys have been conducted to estimate the incidence of CHD at birth in India and other developing countries. As a result ther
How can coacervates be formed of phospholipids or polypeptides? Phospholipids are amphipathic molecules, i.e., they present a polar portion and a nonpolar portion. In contact w
General Principles for Incisions The general principles for placing incisions so as to create surgical flaps remain the same regardless of the reason for creating them. These a
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#affinities of ctenophora with platyhelmintheson..
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HIS T O R Y - Protoplasm was first seen by Corti, 1772 F . Dujardin called it "Sarcode" & observed it in animal cell Term "Protoplasm" was given by J.E. Pu
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