A dominant trait is NOT always the more common trait because

Question

sometimes the dominant allele is rare ~ so it rarely shows up

there are many of them and they show up frequently

Answer 1

A dominant trait is NOT always the more common trait because sometimes the dominant allele is rare, meaning it may not appear frequently in the population even though it can overshadow the effects of a recessive allele when both are present in a heterozygous individual. In other words, just because a trait is dominant does not mean that it is expressed in a large number of individuals.

For example, consider a genetic disorder that is caused by a dominant allele. If that allele is rare in the population, only a small number of individuals will express the disorder, even though the allele is dominant. In contrast, a recessive trait could be more common if the recessive allele is widespread in the population, leading to more individuals expressing that trait when they are homozygous for the recessive allele.

Thus, it is possible for a dominant trait to be rare in the population, making it less common in appearance despite its dominant nature.