Which statement about population affinity estimation is NOT appropriate?

• A. It should be presented with uncertainty and context
• B. It is probabilistic
• C. It can be biased and misused
• D. It provides a definitive assignment to population groups

Answer: (D)

Population affinity estimation is inherently probabilistic and must be communicated with uncertainty and context. Results should be expressed as likelihoods or probability ranges, acknowledging the variability within and between populations, the influence of reference sample choices, and potential admixture. A definitive assignment to a single population group is not appropriate because human genetic and morphological variation does not map to clean categories; overlaps and misclassifications are common. This approach also recognizes that biases can creep in—from which reference populations are included, to how traits are selected, to measurement or analytical errors—and that misusing definitive labels can mislead investigations. In practice, the strongest conclusions come from presenting probabilistic assessments, with clear caveats and integration with other evidence, rather than claiming an absolute, categorical origin.