The allele frequency of all the alleles of a gene present in the population must add up to 1.

Name: The allele frequency of all the alleles of a gene present in the population must add up to 1.
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Quizplus · Accepted Answer

This is because all individuals in the population carry either one or two copies of the allele, and the frequency refers to the proportion of all the alleles in the population. Therefore, the sum of all the allele frequencies for a gene must be 1.

The Allele Frequency of All the Alleles of a Gene