Final answer:
A contemporary biological theorist is more likely to study genetic makeup as a factor that may affect criminal behavior compared to an early biological theorist.
Step-by-step explanation:
A contemporary biological theorist would be more likely to study genetic makeup as a factor that may affect criminal behavior compared to an early biological theorist. Genetic makeup refers to an individual's unique combination of genes, which can influence various traits and behaviors. Biological theorists in the past may have focused more on environmental factors like social class, family structure, and peer influence, but contemporary theorists recognize the significant role genetics play in criminal behavior.