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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.
Glycogenolysis: It is breakdown of glycogen to glucose by means of the reaction series shown in figure 6.11 Like glycogenesis it also occurs in all body cells , But
Symptoms contain fever, weakness, rashes, with erythema and edema. Serum sickness depends on the immune difficult formed and the size of the complexes.
Production of Disease-free Plants Under normal conditions plants are infected by a wide range of pathogens such as bacteria, fungi, viruses, viroids, and insects like nematode
Technique: Careful re-opening of sternum and release of steinum from the underlying adhesion is done. Femoral artery and vein are exposed for going on femoro fenioral bypass
Define Major Sources of water - Water Intake? The preformed water that we consume as water or as beverage. This will include both preformed water in fluids and in foods. The am
TEST CROSS Crossing of F hybrid with its homozygous recessive parent is called test cross and the progeny of test cross is called test cross progeny. A . Monohybrid Te
Functions of Citric Acid Cycle The citric acid cycle is an amphibolic pathway i.e. it is involved in both anabolic and catabolic processes
Explain about the Lipoproteins? These are the Multicomponent complexes of lipids and proteins that form distinct molecular aggregates. They contain polar and neutral lipids, ch
How sugar is used in Meringues? Egg whites beaten for a meringue hold air bubbles as the mechanical action of the beaters partly coagulates the egg protein. Sugars make the pro
Q. How is the gastric mucosa protected from the acid pH of the stomach? The gastric epithelium is mucus secretory that is it produces mucus, the mucus covers the stomach wall p
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