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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. Explain the process of Degradation of Proteins? Proteins are composed of amino acids combined by peptide linkages. The native proteins are resistant to attack by microo
Nine-year-old Alek is admitted to the emergency room with a closed fracture of the right femur. Radiography revels that the fracture crosses the distal epiphyseal plate. What conce
Q. How dissimilar are the location of ribosomes in eukaryotic and in prokaryotic cells? In eukaryotic cells they can also be found free in cytoplasm and mainly adhered to the e
A hollow restoration may be fabricated based on the original form determined by the diagnostic preview. This restoration can be re-lined on completion of the surgical phase of impl
The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no
Imagine an animal that has a system similar to ABO blood types in humans. The ABO part is the same. In addition, they have a second independent gene that creates a mimic A protein,
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general cherecter and anatomical stucture
Escherichia coli is generally regarded as part of the normal flora of the human intestinal tract and that of many animals. Serotypes of E. coli which have been implicated in human
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