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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 Features of Coelom Sensory system consisting of eyes, photoreceptor cells, statocysts, taste buds and tactile organs. Respiration by skin, gills or par
#question about fish
Explain about the Shade Drying? Shade drying is carried out for products which can lose their colour and/or turn brown if put in direct sunlight. Products that have naturally v
Class Hirudinea - Classification of Coelom These are leeches. Number of body segments of these types of animals is fixed; usually there are 34 segments in a few groups there m
Aneuploidy : One or inore chron~osomes of a normal set nlay bc lacking or present in excess. The term riullison~y refers to absence of both the chromosomes of a pair. Monosomy, tri
Soybean protein used as stabilized dispersions Soybean protein concentrates have been used as stabilized dispersions in milk-like beverages and simulated dairy products, such a
QUESTIONS: Write an analysis of the Chapter Twelve, the concluding chapter in ROLL AWAY THE STONE. It will be worth UP TO 50 points if you do it well. Submit it through the "Ex
Why Fats are essential for meeting nutritional need of essential? Fats are essential for meeting nutritional needs of essential, fatty acids like linoleic acid (n-6) and alpha
Q. Food texture and Gas formers? Food texture: Recent studies indicate that strict omission of fibre is of no help on a peptic ulcer patient. The recurrence of peptic ulcer was
Define Citrate Utilization Test - imvic test? Several microorganisms have the ability to make use of citrate as the sole source of carbon and energy. This ability relies on the
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