What term describes an observable trait or characteristic of an organism that results from the interaction of genotype and environment?

The term that describes an observable trait or characteristic of an organism resulting from the interaction of genotype and environment is phenotype. The phenotype includes physical attributes such as height, skin color, and eye color, as well as behavioral traits.

This observable expression of an organism's genetic makeup is not solely determined by its genotype—the genetic instructions inherited from its parents—but also influenced by environmental factors. For example, a plant's height (phenotype) can be affected by both its genetic predisposition (genotype) and the availability of sunlight, water, and nutrients in its environment.

The other terms provided relate to genetics but describe different concepts. Genotype refers specifically to the genetic constitution of an organism. Alleles are variations of a gene that can exist at a specific locus on a chromosome. Haplotype refers to a group of genes within an organism that are inherited together from a single parent. Each of these terms is related to genetics, but they do not encompass the observable traits resulting from both genetic and environmental interactions, which is where the term phenotype comes into play.