Consider six populations of the medium ground finch Geospiza fortis. Selection favors heterozygosity at numerous loci in each of

Question

Consider six populations of the medium ground finch Geospiza fortis. Selection favors heterozygosity at numerous loci in each of the six populations. Migration occurs among all populations (to and from). Under this scenario, which pair of evolutionary forces act in the SAME direction with regard to increasing or decreasing genetic variation within any one of the populations?
O Gene flow and genetic drift
O Gene flow and mutation
O Genetic drift and mutation
O Selection and genetic drift

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