Final answer:
Genes determine physical features by providing biological blueprints and shape behaviors by influencing experiences and interactions in the environment.
Step-by-step explanation:
Genes determine physical features by providing the biological blueprints for our cells, tissues, organs, and body. They shape behaviors by influencing our experiences and interactions in the environment. Genetic linkages have been found for a range of behavioral characteristics, such as personality traits, sexual orientation, and psychological disorders.