Discuss the role of variations in evolution. What is natural selection and genetic drift?
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Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation. random mating between organisms.
Explanation:
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error). ... Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100% frequency, of other alleles.
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