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In the preceding section we emphasised the fact that cvolution or the continuous adaptations to the environment can take place only when pheiiotypes exhibit variability. In the absense of variability, the chances arc that existing living organisms would become extinct since with the change in the environment these organisms would die without leaving progeny. Fortunatcly in living systems mutations and recombinations generate the required variability. However, organisms often strive to arrive at populations which are more or less uniform. This is possible because selection process acts in such a way that a certain degree of uniformity of phenotype is imposed among individuals of n population. If an individual were to be vcry different in some way from thc rest of the population. he would be less well adapted to the environment as compared to other members of the population and therefore unable to compete successfully with them. However, in a continuously changing environment, a slight phenotypic variability should be maintained in a population. In a changing environment no phenotype remains optimally adapted for long. This is the precise reason why variability needs to be generated continuously in a population and used to develop adaptations in the way Darwin suggested. We shall look into the mechanisms that generate variability.
Q. Definition of Osseointegration From the view of the patient? An implant fixture is osseointegrated if it provides a stable and apparently immobile support of a prosthesis un
Systems of Human Body Many organs work in a coordinated'manner to form a system. For example in our-body the nose, the trachea and the lungs form the respiratory system. Table
The aqueous solution with the lowest pH is: Select one: a. 0.01 M HCl. b. 0.1 M acetic acid (pKa = 4.86). c. 0.1 M formic acid (pKa = 3.75). d. 0.1 M HCl. e. 10 t
Can someone describe the fundamental aspects of protein structure? I'm already familiar with the amino acid structure, I just don't have a clear conceptual understanding of protein
can you tell 10 examples of trinomial system of nomenclature?
Define the Consequences of Obesity? Obesity has a number of adverse effects and is a risk factor for several problems as highlighted in Figure. It is a risk factor for all caus
Define Food Business and Food Technology? The food business and food technology are practically inseparable. The food business may be characterized as: vulnerable to spoilage,
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classifcation of protozoans
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