Here's why:

* Phenotype refers to the observable characteristics of an organism, including physical appearance, behavior, and biochemical properties.

* Genotype refers to the genetic makeup of an organism.

While genotype provides the blueprint for an organism's traits, the environment plays a crucial role in shaping the phenotype.

Here are some examples:

* Nutrition: A genetically predisposed tall individual may not reach their full height potential due to malnutrition.

* Climate: The fur color of an animal may be influenced by the temperature of its habitat.

* Social interactions: The behavior of an animal can be significantly impacted by its social environment.

Therefore, the phenotype is a result of the interaction between genotype and environment. It is not solely determined by the genetic code.