Dominant alleles selection is relatively efficient because these are by definition expressed in phenotype. Selection against recessive alleles is less efficient efficient , because these alleles are sheltered in hetero zygotes.
It is impossible to totally eliminate recessive alleles from a population , because the dominant phenotype is selected for , both AA and Aa individuals have that phenotype. Selection against the recessive gene is more significant in changing gene frequency than selection against a dominant gene.
According to hypothesis , section is more efficient in haploids than in diploids , because recessive mutation are directly exposed to selection in haploids , their phenotype effect can be masked in hetero-zygote diploids through dominate alleles.
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