Psychology MCAT Practice Exam

In the context of the nature vs. nurture debate, research suggests that genetics play a significant role in intelligence, even in infancy. While the exact percentage can vary based on different studies and definitions of intelligence, the consensus often leans towards a higher percentage than what was chosen.

Typically, it is posited that around 50% to 70% of intelligence can be attributed to genetic factors, especially as individuals grow older. In infants, while genetics still holds a significant influence, environmental factors such as nurturing, social interactions, and early experiences also play crucial roles in intellectual development. This blend of nature (genetics) and nurture (environment) is essential in assessing overall intelligence, but the genetic contribution is often recognized as playing a foundational role, varying from study to study.

Thus, although the chosen answer indicates a 20% genetic contribution, this figure underrepresents the understanding that genetics significantly influences intelligence from infancy onward, often cited closer to ranges of 50% or more in research regarding developmental psychology and cognitive skills.