The primary concepts addressed are the three tenets of natural selection: heritable variation exists in populations, more offspring are born than can survive and the offspring that do survive are the ones most suited to their environment.
Like many perennial plant species, A. gerardii exists in populations with multiple ploidy levels [50].
Thus, it remains unclear whether the association between parental history and offspring psychiatric disorders exists in population-based samples of youth.
For example, a reciprocal relationship exists in populations between the frequencies of the KIR A haplotype and the HLA-C2 group.
If genetic spatial autocorrelation exists in populations, biparental inbreeding would occur, especially in the area where local genet density is high, since the pollen dispersal is limited in M. stellata as shown in this study.
Thirdly the possibility of type 2 errors may exist in population analyses that are not specifically powered for the comparative analysis.
Sarcoidosis does exist in populations with high TB burden, and the association between sarcoid and TB continues to be an enigma.
Until this long transition to urban living took place among the Slavs, how could the wide range of skills typically found in cities be expected to exist in populations that lived overwhelmingly in the countryside?
High levels of immunity to serogroup A exist in populations living in the "meningitis belt" [39], [40].
In summary, antiviral resistance related mutations already exist in populations of avian influenza A viruses isolated from their natural hosts, i.e., mallard duck, other waterfowl as well as domestic poultry, and domestic swine.
The important risk factors for cVDPV emergence-low prevalence of immunity to poliovirus infection, low OPV coverage and poor sanitation-are likely to exist in populations where case ascertainment is incomplete.
