A group of lady bugs has variation for spot number phenotype and this variation is genetically controlled. There is no relationship between spot number and any environmental pressure in the lady bug's environment. Roughly thirty percent of the population migrates away to a different location and allele frequencies in the original population substantially change as a result of the migration. If the allele frequency changes are maintained in the next generation, select the answer that correctly describes this scenario. O The population has evolved by gene flow. This population has evolved by genetic drift. O This population has evolved by natural selection. This population has evolved by mutation.

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