What determines a trait of an organism is it the number of dominant alleles or the number of coffees of the gene or the combination of its alleles or it's phenotype?

The trait of an organism is determined by the combination of its alleles that make up a gene, as well as how those alleles are expressed in the phenotype. Phenotype is the physical manifestation of the genetic traits, which can be influenced by dominant or recessive alleles, as well as other factors such as environmental influences. Therefore, it is not just the number of dominant alleles or copies of a gene that determine a trait, but rather the interaction and expression of all alleles within an organism's genetic makeup.