The final cause of variation within a population without genetic variability would be phenotypic variability, this phenotypic variability will be determined only by adaptations during the life of the organism.
How can variation arise within a population?
Some factors influence genetic variability, such as mutation, gene flow, sexual reproduction and genetic drift. Among them, mutation is the main factor that generates variability, allowing the emergence of new combinations within the gene pool of the population.
With this information, we can conclude that Genetic variability refers to the variations of genes between individuals in a population.
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