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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.
Physiognomy and Pattern Physiognomy is the general appearance of vegetation as determined by the growth, form of dominant species. It may be considered a synthetic character
A COMPLETE SEMINAR TALK FOR CORAL REEF
Explain Absorption and Metabolism of Minerals? All minerals in the diet are not equally absorbed. Also different compounds and complexes of same mineral are absorbed with diffe
Tools and Techniques - Effects of Plant Growth Regulators We have discussed about the "effect of auxins". In this section we shall discuss the methodology being followed in h
TYPES OF ASEXUAL REPRODUCTION 1 . Binar y fission - Amoeba 2. Multipl e fission -
What are the differences between astral and anastral mitosis? Astral mitosis is that in which there is structure of the aster, a structure made by the centrioles. Anastral mito
B o tu l i s m It is a toxicity in chickens, turkeys, ducks and other aquatic birds caused by a bacterial toxin produced by anaerobic bacteria Clostridium botulinum mai
What is Glands? The central nervous system controls much of the endocrine system through the hypothalamus. The hypothalamus directs many of the body's functions through the "ma
Q. What is an example of intraspecific competition? The Intraspecific competition occurs in practically all species, for instance, the competition of humans for a job.
Bacteria The study of bacteria is called bacteriology. Bacteria are unicellular organisms and possess a distinct cell wall. They are included in kingdom Prokaryote. The bacter
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