Which of the following describes the physical expression of a genotype?

The correct answer is phenotype, which refers to the observable physical and physiological traits of an organism that result from the interaction of its genotype with the environment. This encompasses characteristics such as height, eye color, and even behavior, which can all be influenced by both genetic makeup and environmental factors.

In contrast, the term genotype refers to the genetic constitution of an individual, specifically the alleles present for particular genes. This genetic makeup can contribute to the phenotype, but it is not the observable trait itself. The gene pool refers to the total set of genetic information within a population, and genetic profiling is a technique used to identify an individual's unique DNA characteristics. Thus, while these terms are related to genetics, only phenotype directly describes the physical expression stemming from the genotype.