Answer:
The trait that a given gene will express is determined by a combination of factors, including the specific sequence of the gene, the environment in which the gene is expressed, and the interaction of the gene with other genes and proteins.
The specific sequence of the gene, or the DNA code that makes up the gene, provides the instructions for making a specific protein or RNA molecule. This sequence determines the structure and function of the protein or RNA that the gene codes for, which in turn determines the trait that the gene expresses.
However, the environment in which the gene is expressed can also play a significant role in determining which traits are expressed. For example, environmental factors such as temperature, light, and nutrient availability can influence the expression of genes in plants and animals.