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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.
Define reagents required and methodology for Benedict Test? Reagents Required - Sugar solutions of glucose, fructose, galactose, maltose, lactiose, sucrose and starch.
What is the name of the cytoplasm division in the end of mitosis? What are the differences in this process between animal and plant cells? Cytoplasm division happens after telo
what is entero coelom
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
Gene Project
What is the initial concentration of Beta-adrenergic receptor in blood?
Q. Explain Left Atrial Enlargement ? This chamber is oval in the frontal projection and flattened in lateral projection. On the PA view, its appendage makes a small contributio
Q. What is Etiopathology? Who is likely to develop gout? What are the risk factors? Let us find out. Gout is caused when there is over production of uric acid in normal purine
Categories of Air Pollutants From the above list you can see that the air pollutants can be broadly classified into the following two categories: Primary Pollutants
High blood pressure makes your heart work harder and, over time, can damage blood vessels throughout your body. If the blood vessels in your kidneys are damaged, they may stop remo
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