Which concept is associated with analyzing organisms by their parts rather than as integrated wholes?

• A. Adaptationism
• B. Reductionism
• C. Punctuated equilibrium
• D. Hardy-Weinberg equilibrium

Answer: (B)

Reductionism is the approach that analyzes organisms by breaking them into their component parts—genes, cells, tissues, organs—and explains traits in terms of those pieces and their interactions, rather than treating the organism as a single integrated system. This focus on parts is why it’s the best fit for the description. For instance, a reductionist look at movement might study muscle fiber types, neuromuscular connections, and bone leverage separately to understand how the limb functions, rather than starting from the organism’s overall motion in its environment. In contrast, adaptationism concerns whether traits are adaptive explanations for fitness; punctuated equilibrium describes rapid bursts of evolutionary change separated by stasis; and Hardy-Weinberg equilibrium is a population-genetics model about allele frequencies under ideal conditions. So the concept tied to analyzing by parts is reductionism.