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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.
Sensory Receptors Sensory information received by these receptors is transmitted through sensory fibres of peripheral nerves to sensory areas at different levels of spinal cord
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
Applications : The first operation conducted was ligation of a patent ductus arteriosus through a left thoracotomy. Same approach is used for repair of coarctation of the aorta,
Planning the Nursing Care Provide preoperative and post operative nursing care to child Assist in therapeutic management of child. Provide comfort. S
in what form is most carbohydrates is taken in normal diet
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