Final answer:
The study's inference that a gene linked to both producing healthy offspring and violent tendencies is aligned with sociobiology, which integrates behavior with genetics and natural selection. However, this field is controversial due to debates about the relative influences of nature and nurture on behavior.
Step-by-step explanation:
The reasoning that the gene responsible for producing healthy offspring also produces violent tendencies in individuals, and that these aggressive displays were developed to protect biological offspring, falls in line with sociobiology. Sociobiology suggests that behaviors, including aggressiveness and other social interactions, can be broadly explained in terms of genetics and natural selection. This field considers the evolutionary advantages of certain behaviors, such as male aggression in regard to dominance, mate protection, and extension of their genetic lineage, while also acknowledging the role of natural selection in retaining such behaviors. Despite its contributions to understanding the genetic roots of temperaments and behaviors, sociobiology remains controversial due to the ongoing nature versus nurture debate, emphasizing the importance of environmental factors in shaping behavior.