Question

what are the reasons for variations

Answer 1

Explanation:

Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.

Answer 2

• 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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