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Answer : 3 When there is no selective pressure Explanation : Answer: C) When there is no selective pressure Explanation: Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance. When is genetic drift a major factor in evolution is* When there is low gene flow.* When there is no selective pressure.* When there is a bottleneck.

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