Dominant alleles will always increase in frequency - this statement is true.
What is allele?
The term allele denotes the variant of a given gene. In genetics it is normal for genes to show deviations or diversity all alleles together make up the set of genetic information that defines a gene.
The frequency of an allele has nothing to do with whether it’s dominant or recessive. Recessive alleles can be more common that dominant alleles. It all depends on the allele, the evolutionary history of the population, and selective pressures from the environment.
The dominant allele increases in frequency as it masks recessive alleles. Not all individuals have homozygous dominant alleles but even with a heterozygous combination of alleles, the dominant allele will mask the recessive allele.
Learn more about alleles, refer:
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