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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.
Explain the Frank Furcal Perforation a) Coronal perforation at the pulpal floor of multirooted tooth. b) Due to excessive deepening at the pulpal floor during access perfora
The systems of your body are capable of performing specialized functions that keep you alive and enable you to reproduce. In a very general kind of way, a cell is also capable of p
Explain chilling temperatures - method of food Preservation? (a) Cellar storage temperatures (about 15° C): It is usually used for the storage of surplus foods like root crops,
What is the exchange list? IL is a grouping of foods in which specified amounts of all the foods provide approximately equal amount of (the same amount) carbohydrate, protein a
General characteristics of phylum
Determine the term - techniques visualise anatomy Some techniques visualise anatomy, provide objective confirmation of structural abnormality. These include neuroradiological i
What is the type of genetic inheritance that determines the ABO blood group system? What are the relations of dominance among the involved alleles? The inheritance of the ABO b
Parenchymal Inflammation Parenchymal inflammation can be due to infectious diseases or acute bronchitis or pneumonia discussion will be mainly on pneumania in the following t
Define Factors that affect the requirement of Protein? Protein requirement is greatly influenced by many factors such as age, environmental temperature, energy intake, gender,
Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com
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