In order for the frequency of a particular allele in a population to increase,

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All of these statements contribute to the increase in frequency of a particular allele within a population. Selection for an allele means it confers some advantage that leads to better survival or reproduction. Those with the allele being better reproducers directly increases the allele's frequency in the next generation. Similarly, if individuals without the allele compete less effectively, those with the allele are more likely to survive and reproduce, again increasing the allele's frequency.

In Order for the Frequency of a Particular Allele in a Population