Based on FSTanalyses of nuclear genetic data, high levels of gene flow between islands and populations were reported [ 27].
Furthermore, studies have indicated that human breast cancers and cell lines contain a sub-population of cells characterised by CD44+/CD24−/low/Lin− cell surface markers, and a partial overlap between CD44+/CD24−/low/Lin− and ALDH1-positive populations was reported (Al-Hajj et al, 2003; Ginestier et al, 2007; Fillmore and Kuperwasser, 2008).
In this age of genomics, differences between populations are often reported as having genetic bases [ 26].
Adjustment of the GWAS analysis for population structure can reduce this problem, as demonstrated in previous studies in rice (Zhao et al. 2011) and maize (Van Inghelandt et al. 2012), where similar levels of associations between phenotypes and population structure were reported.
For example, variable prevalence rates were reported between populations of different ethnicities (e.g., 32.4% in an Australian Caucasian cohort (14) vs. 48.0% in a Mexican American cohort (15)) as well as between different populations of the same ethnicity (e.g., 35% in a U.S. Caucasian cohort (13) and 15.3% in a more recent Australian Caucasian cohort).
Between 10 and 100 were reported killed.
In a population of children with an educational diagnosis of pervasive developmental disorder, between 9% and 14% were reported to exhibit aggression.
The weak differentiation between wild and domestic pig populations found in our study was not completely unexpected, since signs of admixture between these populations have been reported in the past, based on both microsatellite markers [ 41] and mitochondrial DNA [ 16].
Variation in environmental and host factors influencing gastric cancer risk between different populations have been reported but little is known about the biological differences between gastric cancers from different geographic locations.
The amount of LD that exists in genomic regions within a population is a key parameter to trace selective sweeps [ 2, 3] and differences in decay of LD between bovine populations have been reported [ 9- 12].
