The (Mis)appropriation of Biological Anthropology in Race Science and the Implications for Forensic Anthropology

Most biological anthropologists acknowledge that phenotypic human variation is distinct from human race. However, there is the potential for the research on human variation to be (mis)interpreted by the public as a reification of biological races. To explore this possible misuse, this study is a content analysis of articles (n = 1146) in the prominent race science journals Mankind Quarterly; The Journal of Social, Political, and Economic Studies; and The Occidental Quarterly. The goal is to investigate how race science employs research in biological and forensic anthropology to justify arguments. Articles were evaluated according to country affiliation, discipline, data sets, racial/ethnic terminology, position on racial hierarchy, position on racial segregation and eugenics, focus of study, views of scientific community, and the average power index (PI). Additionally, specific examples of (mis)appropriation are highlighted. Though the primary discipline represented in these publications is psychology, biological anthropology maintains a presence. Skeletal and dental traits, genetics, and paleoanthropological data are used to argue for biological racial differences and taxonomic distinctions. The research of forensic ancestry estimation was regularly used to legitimize the concept of biological race. While the PIs of the articles are low, they are present on the internet and circulate within social media. The continued use of biological anthropology to reinforce racial essentialism should force practitioners to question the ethical implications of their research. Finally, we provide discussion regarding shiftsin methodology and terminology to address how biological and forensic anthropologists can rectify the damage this research may directly and indirectly cause.

Morphological variation of the deciduous second molars in the Baka Pygmies

The Baka Pygmies are known for their short stature resulting from a reduced growth rate during infancy. They are peculiar also for their teeth erupt earlier than in any other African population, and their posterior dentition is larger than in non-Pygmy populations. However, the Baka’s dental morphology, like several other aspects of their biology, is still understudied. Here, we explore the variation of the Baka’s deciduous upper and lower second molars (dm2s) in comparison to a geographically heterogeneous human sample by means of 3D geometric morphometrics and analysis of dental traits. Our results show that the different populations largely overlap based on the shape of their dm2s, especially the lower ones. Their distal region and the height of the dentinal crown differ the most, with the Baka showing the most extreme range of variation. Upper and lower dm2s covary to a great extent (RV = 0.82). The Baka’s and South Americans’ dm2s were confirmed among the largest in our sample. Despite the Baka’s unique growth pattern, long-lasting isolation, and extreme dental variation, it is not possible to distinguish them from other populations based on their dm2s’ morphology only.

Morphological Variation of the Deciduous Second Molars in the Baka Pygmies

The Baka Pygmies are known for their short stature resulting from a reduced growth rate during infancy. They are peculiar also for their teeth erupt earlier than in any other African population, and their posterior dentition is larger than in non-Pygmy populations. However, the Baka’s dental morphology, like several other aspects of their biology, is still understudied. Here, we explore the variation of the Baka’s deciduous upper and lower second molars (dm2s) in comparison to a geographically heterogeneous human sample by means of 3D geometric morphometrics and analysis of dental traits. Our results show that the different populations largely overlap based on the shape of their dm2s, especially the lower ones. Their distal region and the height of the dentinal crown differ the most, with the Baka showing the most extreme range of variation. Upper and lower dm2s covary to a great extent (RV=0.82). The Baka’s and South Americans’ dm2s were confirmed among the largest in our sample. Despite the Baka’s unique growth pattern, long-lasting isolation, and extreme dental variation, it is not possible to distinguish them from other populations based on their dm2s’ morphology only.

The transition from hunting–gathering to agriculture in Nubia: dental evidence for and against selection, population continuity and discontinuity

Some researchers posit population continuity between Late Palaeolithic hunter–gatherers of the late Pleistocene and Holocene agriculturalists from Lower (northern) Nubia, in northeast Africa. Substantial craniodental differences in these time-successive groups are suggested to result from in situ evolution. Specifically, these populations are considered a model example for subsistence-related selection worldwide in the transition to agriculture. Others question continuity, with findings indicating that the largely homogeneous Holocene populations differ significantly from late Pleistocene Lower Nubians. If the latter are representative of the local populace, post-Pleistocene discontinuity is implied. So who was ancestral to the Holocene agriculturalists? Dental morphological analyses of 18 samples (1075 individuals), including one dated to the 12th millennium BCE from Al Khiday, near the Upper Nubian border, may provide an answer. It is the first Late Palaeolithic sample ( n = 55) recovered within the region in approximately 50 years. Using the Arizona State University Dental Anthropology System to record traits and multivariate statistics to estimate biological affinities, Al Khiday is comparable to several Holocene samples, yet also highly divergent from contemporaneous Lower Nubians. Thus, population continuity is indicated after all, but with late Pleistocene Upper—rather than Lower Nubians as originally suggested—assuming dental traits are adequate proxies for ancient DNA.

Remembering John C. Loehlin: ‘Our Field Has Lost a Lion’/Twin Research Reviews: Cognitive Skills and Social Mobility, Risk of Arachnoid Hemorrhage, Heritability of Dental Traits, and Twin-to-Twin Transfusion Syndrome/Media Reports: Identical Twins With Different Health Histories, Twins Born 97 Days Apart, Retiring Twin Tennis Players, TikTok Twins and Twin Reality Stars

John C. Loehlin, professor of psychology at the University of Texas, at Austin, passed away on August 9, 2020. John was 94 years of age. He will be remembered for his seminal contributions that have furthered the field of twin research in so many ways. An overview of his career is presented, with fond memories from his son and several colleagues. This tribute is followed by reviews of twin research on cognitive skills and social mobility, risk of subarachnoid hemorrhage, heritability of selected dental traits and twin-to-twin transfusion syndrome. Finally, twin-related topics of human interest include identical twins with different health histories, twins born 97 days apart, retiring twin tennis players, TikTok twins and twin reality stars.

Biological Relationships

Weiss and Springer explain the many ways anthropologists determine biological relatedness; DNA, mitochondrial DNA, Y-chromosome DNA, metric and nonmetric cranial and dental traits are all types of data used to reconstruct who is related to whom. These methods have helped to answer how the Americas were peopled.

Testing the utility of dental morphological trait combinations for inferring human neutral genetic variation

Researchers commonly rely on human dental morphological features in order to reconstruct genetic affinities among past individuals and populations, particularly since teeth are often the best preserved part of a human skeleton. Tooth form is considered to be highly heritable and selectively neutral and, therefore, to be an excellent proxy for DNA when none is available. However, until today, it remains poorly understood whether certain dental traits or trait combinations preserve neutral genomic signatures to a greater degree than others. Here, we address this long-standing research gap by systematically testing the utility of 27 common dental traits and >134 million possible trait combinations in reflecting neutral genomic variation in a worldwide sample of modern human populations. Our analyses reveal that not all traits are equally well-suited for reconstructing population affinities. Whereas some traits largely reflect neutral variation and therefore evolved primarily as a result of genetic drift, others can be linked to nonstochastic processes such as natural selection or hominin admixture. We also demonstrate that reconstructions of population affinity based on many traits are not necessarily more reliable than those based on only a few traits. Importantly, we find a set of highly diagnostic trait combinations that preserve neutral genetic signals best (up to x∼r = 0.580; 95% r range = 0.293 to 0.758; P = 0.001). We propose that these trait combinations should be prioritized in future research, as they allow for more accurate inferences about past human population dynamics when using dental morphology as a proxy for DNA.

The Ethnogenesis of Pescador Identity

Chapter 9 discusses ethnogenesis on the north coast of Peru from the perspective of bioarchaeology at the Initial Period site of Pampa Gramalote (1500–1200 cal B.C./3450–1350 cal BP) in the Moche valley in northern Peru. The authors examine the genetic relationship between fishing and contemporary, nearby populations using dental traits. They conclude that Gramalote contrasts sharply with preceding maritime populations of the Peruvian Preceramic Period and exchanged mates with farming populations in the adjacent valley. Ethnic identity here is not coterminous with genetics but rather a result of shared economic activities.