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Estimating genetic ancestry proportions from faces.

Yann C Klimentidis¹, Mark D Shriver

¹Department of Anthropology, University of New Mexico, Albuquerque, NM, USA. yann@unm.edu

|February 19, 2009

Summary

Genetic admixture estimates from facial features show surprising accuracy but vary by observer ethnicity. Perceptions of ethnic affiliation can differ significantly from genetic ancestry, highlighting the complexity of self and group identification.

Area of Science:

Human genetics
Social psychology
Anthropology

Background:

Ethnicity is a key aspect of self-identification and social interaction, potentially reflecting evolutionary adaptations for group living.
Recent population admixture in the US, coupled with historical emphasis on phenotype, creates opportunities to study ethnicity perception.
Understanding the relationship between genetic ancestry and perceived ethnicity is crucial in diverse societies.

Purpose of the Study:

To investigate the concordance between genetic estimates of Native American, European, African, and East Asian admixture and visual assessments of facial features.
To determine if observer ethnicity influences the accuracy of estimating genetic admixture from photographs.
To explore the discordance between physical appearance and genetic measures of ethnicity.

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Main Methods:

Genetic admixture proportions (Native American, European, African, East Asian) were measured in 14 self-identified Hispanic individuals.
Photographs of these individuals were presented to 241 observers in New Mexico for visual estimation of Native American admixture.
Concordance was assessed by comparing observer estimates to genetic admixture data, analyzing variations based on observer demographics.

Main Results:

Observers demonstrated a significantly higher concordance than chance in estimating genetic admixture from facial features.
The accuracy and direction of estimation discrepancies varied significantly based on the ethnicity of the observer.
Observer age and sex did not significantly impact the concordance or discrepancy in ethnic admixture estimates.

Conclusions:

Visual cues of facial features can provide a surprisingly accurate, albeit imperfect, estimate of genetic admixture.
Perceptions of ethnicity are context-dependent and influenced by the observer's own ethnic background.
This study underscores the potential for significant discordance between an individual's physical appearance and their genetic ancestry, impacting ethnic identification.