Most serious deleterious alleles are

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Most serious deleterious alleles are recessive because they are only expressed in the phenotype of a homozygous individual. Heterozygous carriers of the recessive allele usually do not exhibit the negative effects of the allele, but can still pass it on to their offspring. Dominant and codominant alleles are more likely to be expressed in the phenotype and therefore, are less likely to persist in a population if they have deleterious effects. However, it is important to note that some deleterious alleles may be maintained in the gene pool due to factors such as heterozygote advantage or genetic drift. Therefore, option D) - no longer a part of the gene pool is not necessarily true.

Most Serious Deleterious Alleles Are