What is a dominant and recessive trait?
A dominant trait is a trait that is expressed when an individual has at least one copy of the dominant allele (a variant of a gene), regardless of whether the individual also has a copy of the recessive allele. In contrast, a recessive trait is only expressed when an individual has two copies of the recessive allele.
For example, having brown eyes is a dominant trait, while having blue eyes is a recessive trait. If an individual has one allele for brown eyes and one allele for blue eyes, they will have brown eyes because the brown eye allele is dominant. However, if an individual has two alleles for blue eyes, they will have blue eyes because the blue eye allele is recessive.