Natural selection changes allele frequencies because some ________ survive and reproduce better than others.

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Natural selection operates on individuals, not directly on alleles, loci, or species. Those individuals with advantageous traits (which are determined by alleles) are more likely to survive and reproduce, thereby passing those advantageous alleles to the next generation and changing allele frequencies over time.

Natural Selection Changes Allele Frequencies Because Some ________ Survive and Reproduce