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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. Illustrate the major cells of the nervous system? The major cells of the nervous system are the neurons. as well the neurons the nervous system is also constituted of glial
Q. Example of Trial Balance columns? Start by extending all of Micro Train's revenue and expense account balances in the Adjusted Trial Balance columns to the Income Statement
#what is the habitat of phylum protozoa
Adverse Effects of Imiquimod Application site reactions (irritation, pruritus, flaking, erosion) are generally mild to moderate in intensity and resolve within 2 weeks of cessa
Phagocytosis is the ingestion of huge particles like as bacteria and cell debris by large endocytic vesicles called as phagosomes. In order to be ingested the particle must first
Biological effects: Aflatoxins are acute hepatotoxins and are known to be carcinogenic in some animal species as rat. Aflatoxin B1 is acutely toxic and is responsible for liver nec
how to explain an example from each class of vertebrate
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Restricted Food Items Foods to be avoided by diabetic patient are carbohydrate and fatty food. Carbohydrates are classified into sugars and starches. As you have studied in und
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