The relationship between gene expression and phenotype is fundamental in understanding how genetic information translates into observable traits. Gene expression involves the processes of transcription and translation, ultimately leading to the production of proteins that influence an organism's physical and biochemical characteristics. Variations in gene expression can result from environmental factors, developmental stages, or regulatory mechanisms, ultimately shaping an organism's phenotype. This connection is crucial for studies in genetics, developmental biology, and evolutionary biology, illustrating the intricate link between genes and traits.