Concept Introduction:-
The differentiate in DNA between individuals or communities is known as genetic variation.
Explanation:-
A question has been provided to us
We need to find the solution to the question
The variations in organisms can arise due to various reasons. Most common of these are the variations caused due to sexual reproduction and variations caused due to mutations.
In sexual reproduction, the gametes are formed by meiosis, during which crossing over of chromosomes occurs, giving opportunity for new combination of genes. Then, the fusion of these haploid gametes takes place, which further leads to combination of DNA belonging to two different organisms, and, thus, results in varition in the newly formed individual. Some variations may also occur due to random mutations in the genome of an individual. If these mutations are beneficial, they may get inherited to the next generations also, and, thus, lead to variations.
Most of the times, variations developed, are helpful for the survival of species. The new variations, if associated with more chances of adaptations with changing environment, are selected by the nature and thus give better chances of survival to the species.
Final Answer:-
The correct answer is the most common of these are the variations caused due to sexual reproduction and variations caused due to mutations.
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