All of the above factors contribute to determining a trait of an organism. The number of dominant alleles an organism possesses for a specific trait affects whether that trait will be expressed. The combination of the alleles an organism inherits from its parents determines the specific variations of the trait that it will exhibit. The number of copies of a particular gene also influences the expression of a trait. Lastly, the phenotype, which refers to the observable characteristics of an organism, is the result of the interaction between these genetic factors and environmental influences.
