A population's allele and genotype frequencies.
Evolution, particularly from a population genetics perspective, can be defined as change in the genetic structure of populations over time. Note that this definition is broader than change in allele frequency over time. That is, particularly for diploid organisms, genotype frequencies are both different from allele frequencies and relevant to a population's characteristics as well.
Alternatively, with haploid organisms, allele frequencies and genotype frequencies can be treated more or less equivalently.
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