I found an interesting study on genetics:
Measuring and Using Individual Genomic Ancestry to Study Complex Phenotypes
http://etda.libraries.psu.edu/theses...038/index.html
http://etda.libraries.psu.edu/theses...038/Thesis.pdf (3,5MB)

For more info: iindrani@hotmail.com

Abstract:
Quote Originally Posted by Indrani Halder
Several complex diseases show population specific differences the causes for which are as yet unknown. Examples of such diseases include obesity and non insulin dependent diabetes which are more prevalent in African American, Indigenous American and Latino populations compared to European Americans. Dementia and Osteoporosis are examples of diseases which are more prevalent in European Americans. It is obvious from these examples that the differences follow broad racial or ethnic categories and because of this correlation, medical research has focused extensively on investigating racial or ethnic differences in disease risk. The concept of ‘Race’ is multifaceted and any simplistic annotation is insufficient, may be even wrong, unless we make attempts to decompose the different aspects of race and use them appropriately in the context of biomedical research. Broadly speaking, race has two distinct components. The biological component referred to as Biogeographical ancestry; and the sociocultural component which reflects the ethnic heritage of an individual. Anthropological and genetic research in the past couple of decades has shown that the concept of typological races is scientifically obsolete yet the idea lives on and is used in biomedical research. Race/Ethnicity is still used as a classifier to establish and highlight population specific differences, while often inter-individual variation within a specific racial/ethnic category is ignored. Anthropological research has shown that anatomically modern humans originated in Africa, and migrated to different parts of the world. Over the course of time, continental populations were established and for a period, large scale interactions between continental populations were limited. ... In the past few centuries, there have been large scale migrations, voluntary or forced, that gave rise to populations of “mixed” ancestry. And at those loci where allele frequencies differed between continental populations, this has resulted in long range non random association in the admixed population.... Preliminary admixture mapping of hypertension and obesity have been performed and are presented. One locus has been identified that shows strong linkage with obesity in an African American sample.
The abstract makes some politically correct statements that are actually not supported by the study. Just look at the graphs in the pdf file!!!