Is the most common phenotype always the dominant genotype?
The most common phenotype does not result from the dominant genotype, because the dominant allele may occur less frequently than the recessive allele. Examples are achondroplasia, polydactyly, widow’s peak, and Huntington’s chorea, all of which are caused by dominant alleles. We don’t see these phenotypes very often because the alleles that cause them are very uncommon in the human gene pool.
