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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.
Under conditions when a cell only needs to use the nonoxidative portion of the Pentose Phosphate pathway to synthesize ribose-5-phosphate, the elevated levels of NADPH in the cell
Nitrogen Control of Nitrogen Assimilation N 2 -fixer like Klebsiella pneumoniae and Nostoc can grow with N 2 , NO - 3 or NH + 4 as nitrogen source. You would like to know
A restriction enzyme or restriction endonuclease is an enzyme which cuts DNA at particular recognition nucleotide sequences with Type II restriction enzymes cutting double-stranded
Evolution of Metazoa The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicel
How many asymmetric carbons does the amino acid serine have? Please explain with a strucutral diagram if possible.
Q. What is Dyslipidemia or Hyperlipidemia? It has been known for over five decades now that dyslipidemia is associated with increased severity and prevalence of atherosclerosis
i need information about speen of animals and stuff like that for example a cheetah speed
Define Inhibitors and Enhancers - absorption of dietary iron? Phytates and fibre from whole grain cereals, tannins and polyphenols in tea, oxalates in green leafy vegetables li
how do i classify mythical creatures into a web?
Q. What is the crystallization of a virus? What is the significance of this process? Crystallization is the procedure of transformation of viral components into organized solid
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