All of the above factors can determine a trait of an organism. The number of dominant alleles can influence the expression of a trait, as dominant alleles tend to override recessive alleles. The phenotype, which is the physical or observable characteristics of an organism, is also determined by the interaction between genes and the environment. The combination of an organism's alleles, including both dominant and recessive alleles, will determine the traits it exhibits. Finally, the number of copies of certain genes may also play a role in determining a trait, as multiple copies of a gene can result in an amplified phenotype.
