Albert B. Harper

Origins and Divergence of Aleuts, Eskimos and American Indians

The apportionment of average gene frequency differences into within and between groups of Aleuts, Eskimos and Athabascans reveals a testable model of the time of origin and differentiation of these populations. Based on the ratio of average difference between Aleuts and Eskimos, to the average difference between Bering Sea Mongoloids and Athabascans, we estimate that Athabascans diverged from Bering Sea Mongoloids at approximately 15 000 BP. The ratio of Aleut/Eskimo to Yupik/Inupiaq suggests the split between the latter occurred 5100 BP. Similarly, the within-group average gene frequency differences suggest that North American natives originated some 19 000 BP and that Bering Sea Mongoloids originated 10 200 BP. These estimates are highly concordant with independent archaeologic, linguistic and biological data.

Growth Status and Performance Relative to Parental Size

Abstract The relationship between parent size and the stature and performance of their offspring was considered in a cross-sectional sample of Philadelphia Negro and white children of elementary school age. Parents were classified into six mating combinations according to their stature. Analysis of the childrens stature and performance by parental stature-mating combinations indicated a well-defined parent size-related trend for stature, a suggestive size-related trend for static strength, and an inconsistent parent size relationship for gross motor performance.