Answer:Just because a gene is dominant, and it takes just one translated allele for the trait to appear, doesn't necessarily mean that it's a physical trait that you'll see frequently in the population. Some dominant genes are rare, meaning that a small subset of humans have the dominant allele.
Step-by-step explanation:
Dominant and Recessive Traits in Selected Domestic Animals. From: Genetics of Domestic Animals ... Species, Dominant Trait, Recessive Trait.