Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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. Causes of Non-Ketotic Hyperosmolar Diabetic Coma? The causes of NKHDC are given below: 1) Infections 2) Trauma 3) Burns 4) Myocardial Infarctions (heart attack)
SED A TIV E HYPNOTICS - They depress the activity of CNS. Reduce excitement, give feeling of calm. Higher doses induces sleep. Sleep inducing drugs are also called
What is the normal duration of the menstrual cycle? How does the calendar contraceptive method work? The normal duration of the menstrual cycle is 28 days but it can vary betwe
In eukaryotes, the electron transport and oxidative phosphorylation occurs in the inner membrane of mitochondria. These processes re-oxidize the FADH 2 and NADH which comes
To which heart chamber does the blood go after leaving the left atrium? What is the valve that separates these compartments? The arterial blood that has come from the lungs to
Darwin put fort the notion of the survival of the fittest. How do we define 'fittest'? The answer usually given is those who survive. So you can readily see that this is a circular
A cDNA library is made by using the reverse transcriptase of a retrovirus to synthesize cDNA (complementary DNA) copies of the total mRNA from a cell (or perhaps a subfraction
Salmonellosis The genus Salmonella comprises nearly 2500 serovars, traditionally based on Kauffman-White scheme in which H (flagelar) and O (somatic) antigens determine the ser
Define Tests to Measure Muscular Strength and Endurance? It is important to first understand the difference between muscular strength and endurance. To know the muscular streng
difference between optic nerve and auditory nerve
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd