Expression of variability, Biology

Assignment Help:

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.


Related Discussions:- Expression of variability

Diet for cardiac patients, Diet Continue diet as prescribed at hospita...

Diet Continue diet as prescribed at hospital. Some may continue fluid and salt restriction, some may have to restrict iron and Vitamin K rich food stuff. The patient needs t

Discuss in short about soil, Discuss in short about soil " The collecti...

Discuss in short about soil " The collection of  natural bodies in the Earth's surface, in places modified or even made by man of Earthy materials, containing living matter  an

Explain the pre pregnancy weight and foetal outcome, Explain the Pre Pregna...

Explain the Pre Pregnancy Weight and Foetal Outcome? Several studies from around the world from developing and developed countries have demonstrated an association between pre-

Major parts of the human ear, Q. What are the major parts of the human ear?...

Q. What are the major parts of the human ear? The human ear is divided into three major parts: the external ear, the internal ear and the middle ear.

What are the factors that for influencing photosynthesis, What are the fact...

What are the factors that for influencing photosynthesis also interfere with the gross primary productivity? Mostly water and light, but also mineral salts, temperature and car

Blood, how to know what type of blood are?

how to know what type of blood are?

What is centrioles in cell structure, What is Centrioles in cell structure?...

What is Centrioles in cell structure? Most cells of higher organisms contain pairs of cylindrical bodies called centrioles, which help to organize microtubules in cell division

Whta are radial loops , When the chromosomes  are depleted  of histo...

When the chromosomes  are depleted  of histones  they  are seem  to have  a central fibrous 'protein  scaffold'  or nuclear  matrix  to which the DNA is attached  in loops. Therefo

Spoilage of soft drinks, Q. Explain Spoilage of Soft Drinks? We all co...

Q. Explain Spoilage of Soft Drinks? We all consume soft drinks, fruit juices, as well as, preserves, which normally are available in the market as tetrapacks, cans, bottles

Conductometry, conductometry and its uses in biological experiments

conductometry and its uses in biological experiments

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd