Final answer:
Biological make up is influenced by both genes and environmental factors, as evidenced by epigenetics and the concept of genetic environmental correlation. The environment can either enhance or inhibit the expression of genetic traits, affecting an individual's phenotype and even behavioral attributes.
Step-by-step explanation:
The concept of epigenetics is key to understanding what is influenced by both genes and environmental factors. The answer to the student's question is B. Biological make up, as it is a direct product of the genetic inheritance interacting with various environmental factors throughout an individual's life. Factors such as physical drives, individual human history of interactions, and conditioning-learned behavior patterns all contribute to the biological make up of an individual. Furthermore, population variance is influenced by genetic structure, environment, and diet composition among others, showcasing the intertwining of genetic and environmental influences.
Examples of how the environment can influence genetic expression include the way sun exposure affects skin color or how the children of athletes may reach their full genetic potential through their environment, which supports their inherited athletic traits. Therefore, both intrinsic genetic factors and external environmental conditions collaborate to shape our physical and behavioral attributes.