>>330719If a novel gene produces a new protein, it is always dominant. Recessive alleles usually either cause very little or no protein to be produced, and are overran by dominant alleles that cause the production of more protein.
For example blue eyes need two copies of an allele that causes very little brown pigment in the eye. The lack of the pigment causes the eye to remain blue. Even one copy of the brown allele causes so much brown pigment to be produced that the eyes will become brown. (For green eyes you need more genes and more alleles etc.)