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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.
Which are the brain regions associated with memory? According to researchers some of the main regions of the nervous system associated with the memory phenomenon are the hippoc
1. Discuss how nursing has changed over the last two (2) decades. 2. Review and summarise the philosophy of your enrolled nurse course and its relevance to your clinical practic
STERNU M - It is long, naroow, flat vertical bone in the middle of the front wall of the chest. 15 cms long. It is dagger shaped having manubrium body & xiphoid process.
What does S-shaped pattern of population growth show? How is J-shaped pattern dissimilar from it and why?
Lipase Pancreatic lipase specifically hydrolyses the primary ester linkages i.e. at the position 1 and 3 of triacylglycerols. The presence of bile salt helps in emulsificat
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Consider an axon of a neuron. At time=t1, its voltage is at threshold for an action potential; at time=t2, its voltage is at 0 millivolts prior to the peak of that action potential
Discuss about xeno-transplanation Most defects / diseases treated by xeno-transplanation are not genetic in origin so the therapy will have no impact on gene pool in terms of c
Glycogen synthesis and degradation in the liver and muscle is very similar. Which of the following enzymes is not used in both muscle and liver for these metabolic pathways? -ph
Define Integrity of Epithelial Tissues? Vitamin A is essential for the integrity of the mucous-secreting cells. In fact vitamin A maintains the health of epithelial cells that
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