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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.
List out Points about the Traditional Food Preservation? 1. The traditional food preservation methods like drying, pickling, salting, smoking, canning and freezing have been wi
GREGOR JOHANN MENDEL 1. Mendel was born on 22 July 1822 at Heizendorf in Austria at Selesia village. 2. Mendel was worked in Augustion Monastry as monk at Br
Functions of Citric Acid Cycle The citric acid cycle is an amphibolic pathway i.e. it is involved in both anabolic and catabolic processes
Evolutionary Classification Evolutionary classification combines aspects of both phenetic and cladistic systematic. Evolutionary taxonomists attempt to show in their classifica
Q. Bone Loss - criteria for endosteal implants? Crestal bone loss after intial healing is a primary indicator of the need for initial preventive therapy. Early loss of crestal
Bacteria never have a nucleus but some members of the domain Archaea are known to contain a true nucleus.
Pressure Gradient You know that air pressure is the weight of the atmosphere over a unit area of the earth's surface. The average air pressure at sea level is approximately 1 k
Absorption of amino acids and peptides Generally, the dietary proteins are almost comp!etely digested to their constituent amino acids and these are rapidly absorbed from
Bacteria:- Advantages High yield of protein (60-80%) Can be grown on paraffin, cellulose waste and molasses. Growth rate is fast. Disadvantages If the bacteri
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