Mixed Race Studies

Analysis of a Tri-Racial Isolate

Human Biology
Volume 36, Number 4 (December 1964)
pages 362-373

William S. Pollitzer
Department of Anatomy
University of North Carolina, Chapel Hill

Based on a paper presented at the meeting of the American Association of Physical Anthropologists in Philadelphia, May 2, 1962

A relatively isolated population in the state of North Carolina, composed of persons who call themselves Indian but who appear to be of tri-racial origin, provides a model for the study of analysis by gene frequencies of a mixed population of White, Negro, and Indian ancestry.

A people considered Indian is known to have occupied this territory by the mid-eighteenth century; they spoke English, tilled the soil, and owned slaves. English, Scotch Highlanders, and French Huguenots migrated into the area in the eighteenth century also. Planters from neighboring states settled in this vicinity, often bringing slaves and a few free Negroes with them. The most common names of the free Negroes are the same as those of the present-day mixed population.

The origin of the Indian component of this hybrid population is open to speculation; three ideas have been advanced. The most colorful theory is that the people of the present isolate are the descendants of Raleigh’s famous “Lost Colony” who mixed with the Croatan Indians, an Algonquin-speaking tribe on the coast. Some similarity in the names of the colonists and the names in the present population, plus a few cultural traits, have been construed as evidence for this view. Another suggestion is that the Cherokee, a powerful Iroquois-speaking tribe who had general overlordship in the Western Carolinas, contributed the Indian genes to the hybrid group. Finally, the view has been advanced that the Siouan-speaking tribes who lived in the Piedmont Carolinas, e.g., the Catawba, were the Indian stock involved.

Considerable phenotypic variation is found within the isolate today, with extremes of skin color from light to dark and of hair form from very curly to straight- The morphology of the face also suggests broad racial backgrounds. It is therefore of interest to learn what the blood factors and hemoglobins tell of the composition of this population of multiple racial origins.

In 1958, in cooperation with Dr. Amoz Chernoff, blood samples were…

The Seminole Indians of Florida: Morphology and Serology

American Journal of Physical Anthropology
Volume 32, Number 1 (January, 1970)
pages 65-81

William S. Pollitzer
University of North Carolina, Chapel Hill

Donald L. Rucknagel
University of Michigan

Richard E. Tashian
University of Michigan

Donald C. Shreffler
University of Michigan

Webster C. Leyshon
National Institute of Dental Research, NIH

Kadambari Namboodiri
Carolina Population Center
University of North Carolina

Robert C. Elston
University of North Carolina

The Seminole Indians of Florida were studied on their three reservations for blood types, red cell enzymes, serum proteins, physical measurements, and relationships. Both serologic and morphologic factors suggest their close similarity to other Indians and small amount of admixture. The Florida Seminoles are similar to Cherokee “full-bloods” in their absence of Rho and their incidence of O and M. In the presence of Di^a they are similar to other Indians, especially those of South America. While the presence of G-6-P-D A and the frequency of Hgb. S are indicative of Negro ancestry, the absence of Rho suggests that the Negro contribution must have been small. Physical traits give parallel results. Both serology and morphology further show that the Seminoles of the Dania and Big Cypress reservations are more similar to each other than to those of the Brighton reservation, in keeping with their history.

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The Cajuns of Southern Alabama: Morphology and Serology

American Journal of Physical Anthropology
Volume 47, Issue 1 (July 1977)
pages 1-6
DOI: 10.1002/ajpa.1330470103

William S. Pollitzer
University of North Carolina, Chapel Hill

Kadambari K. Namboodiri
University of North Carolina, Chapel Hill

William H. Coleman
University of Alabama, Huntsville

Wayne H. Finley
University of Alabama, Birmingham

Webster C. Leyshon
Laboratory of Developmental Biology and Anomalies
National Institute of Dental Research, Bethesda, Maryland

Gary C. Jennings
University of Florida, Gainesville

William H. Brown
University of North Carolina, Chapel Hill

A survey was conducted of 324 members of the Cajun isolate of Southern Alabama. Tradition and appearance suggest that this population of about 3,000 are not entirely White, Black, or Indian but constitute a triracial community somewhat reproductively isolated and inbred. The earliest American settlement in the area, along the banks of the Mobile and Tombigbee Rivers, lay between Spaniards to the South and Indian tribes on the other sides: Creek, Choctaw, and Cherokee.

Physical measurements are reported for 71 adults, plus color of skin, eyes, and hair. X-rays were taken of wrist and ankle bones of some 253 children. Red blood samples were typed on adults and children, and haptoglobin, Gm, and Gc types were determined from serum. History and physical examinations were also made.

Physical measurements and observations suggest predominantly White ancestry, and D² analysis confirms this, with least similarity to Indians. Analysis of serological traits implies almost 70% White, almost 30% Black, and very little Indians genes. Few defects of clear genetic etiology were discovered. Growth patterns judged from X-rays appeared normal. All genetic loci testable were in Hardy-Weinberg equilibrium except Gc. While history and some common surnames suggest endogamy in the past, the medical and serological findings, plus some additional surnames, indicate that the isolate has already been largely diluted or dissolved.

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The Physical Anthropology and Genetics of Marginal People of the Southeastern United States

American Anthropologist
Volume 74, Issue 3 (June 1972)
pages 719–734
DOI: 10.1525/aa.1972.74.3.02a00360

William S. Pollitzer
University of North Carolina

Admixture of White, Negro, and Indian peoples of the Southeastern United States from colonial days on has led to some unique populations isolated by social status. In time they formed distinctive gene pools. On the basis of physical traits and serological factors, it has been possible to reconstruct the approximate genetic contribution of parental populations to the hybrid ones. Some inherited diseases have also been concentrated in these isolates. Both differential fertility and changing social factors may affect the future of these populations.

Over vast spans of time populations of mankind have evolved many physical differences. In accordance with well established genetic principles, they arose because mutations in the genes controlling such traits occurred at random but conferred upon the individuals selective advantages. Thus, heavy pigmentation of the skin may have been an advantage to those living in the extreme sunlight of the tropics. Some anthropologists believe that body form and facial features may similarly represent adaptations to extremes of temperature and humidity. Geographical barriers such as oceans and deserts serve to isolate populations and emphasize their distinctive characteristics, although gradients exist between the physical traits of related people. Man’s increasing capacity for food production, most notably in the neolithic era when the cultivation of crops and domestication of animals greatly increased his food resources, contributed to the growth of populations. Particular groups of people of similar appearance expanded in numbers and later in territory, giving the impression that the earth was populated with a few “races.” An earlier generation of anthropologists, searching for distinct types, classified all people on the basis of a few physical traits such as skin color, hair form, head shape or nose width. More modern students of mankind have recognized that there are indeed only clines or gradients in all of these traits and that mixture is a universal phenomenon.

Can we then speak of “races” of man at all? While the concept of fixed types remains in the popular thinking, many scientists have gone to the opposite extreme and denied the reality of race at all. My own position is an intermediate one in which I liken human populations to the surface of the earth. Here is a small elevation and, there, a larger one; here is a single contour and, there, a doubled one. Shallow valleys separate some high ground; deep valleys separate others. Who can say, then, what is to be labeled a hill and what is to be called a mountain? Shall we use one name or two names for closely related projections? Where we draw the line-what labels we attach-these are arbitrary decisions; but the rises and the falls in the earth’s surface are facts of nature. So it is with human populations. How finely we wish to divide them, how broadly we lump them or the designations we give to them will inevitably vary; but large populations with distinctive features are still recognizable. It is, of course, mating preferences for physical characteristics which govern the collection of genes in so-called gene pools; and it is our culture which determines these choices. In that sense, those physically recognized groupings which we may popularly refer to as “races” are dependent upon our culture both for their formation and for their definition…

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