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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.
CHARACTERISTIC S OF MAN - Humans posses erect posture and bipedal locomotion. Humans possess large sized brain. Humans are less dependent on smell. Humans possess
Biochemical Changes - Consequences of Aging Several biochemical changes are correlated with aging. Detailed biochemical studies in rats have been carried out by Prof. M.S. Kan
is there a difference between the giant asiatic bees apis dorsata and Philippine giant bees apis breviligula
Atelectasis and Pneumonia Signs and symptoms are LV failure, hypovolemia, hypervolemia or renal vasoconstriction. Decreased breath sounds, poor ABG and poor cough reflex
Q. Complications of diverticular disease? The many complications of the disease include the 'following conditions: • A perforation (hole) in the intestine leading to perito
Action of carbon dioxide receptor cells The respiratory center is sensitive to increased carbon dioxide levels and increased acidity of the blood. It is peculiar that even tho
DNA replication in eukaryotes is much more complex than in prokaryotes while there are various same aspects. The Eukaryotic cells can only initiate DNA replication at a particular
Do plants have tissue organization and specialized organs? Plants have specialized organs (as reproductive organs, roots, limbs, leaves) and differentiated tissues (vascular t
Q. What is the difference between spermatocyte I and spermatogonium? The male germ cells are the spermatogonia (diploid cells, 2n) situated in the testicles and they mature an
What is an etiological agent of disease? An etiological agent of disease is the agent that causes the disease. It might be a living being, substance or environmental fact.
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