the dominant allele is usually represented by a capital letter, while the recessive allele has a lowercase letter. Let's say that the gene for flamingo color is represented by the letter P. The pink allele is dominant, so it would get a capital P, but the purple allele is recessive, so it would get a lowercase p.
Any allele that is Dominant is represented by a capital letter (Ex. DD or Dd) either is considered DOMINANT as the D that hold the dominant trait is expressed
