define variation?and what is the importance of variation.?
Answers
Variation is referred to ‘ not being identical but differ in appearance' (phenotypic as well as genotypic expression). Genetic variation occurs even in identical twins.
Genetic diversity, differences within a species.variation may be defined as the differences among the individual of the same species. Intra specific variation among the different genera. They have two types somatic variation and germinal variation
IMPORTANCE:-
They make an organism better fitted to struggle for existence in a particular environment. They also enable human beings to improve the races of important plants and animals. However, they are unable to form a new species though Darwin (1859) based hisevolution theory of natural selection on continuous variations. Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. ... Genetic variationis advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.
Genetic variation creates a larger pool of traits in a species so that given a novel environment, at least someone would have the trait needed to survive.
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Variation is defined as the difference in the characters or the traits among the individuals of a particular species...
The process of reproduction introduces favourable variations in the offsprings of a particular species. These variations may enable some of the organisms to survive even in extreme conditions of temperature, climate, etc., While all others of that species die. This will prevent the species from getting wiped out of the Earth. Thus, reproduction help in providing stability to populations of species,
through the introduction of favourable variations...
Reproduction involves the copying of nucleic acids. Variations are introduced in the offsprings, as the DNA copies generated will be similar, but not identical to the original, and to each other. No biochemical process is absolutely reliable. Some of the changes may be so drastic that the new DNA copy may not be able to work with the cell apparatus it inherits. As a result, the newborn cell will die. Thus, variation is beneficial to the species, but not necessarily for the individual...
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