In toxicity assays, probit analysis allows to relate the parameters of the regression line describing the dose-mortality relationship to a Gaussian frequency distribution of tolerance thresholds in the population of individuals tested [ 50].
Obviously, the selective 'usefulness' of such 'emergency' adaptation should have become less and less with time down to nullification as the frequency of lactose tolerance was increasing.
It turns out that cultures with a history of dairy farming and milk drinking have a much higher frequency of lactose tolerance – and its associated gene – than those who don't.
One single nucleotide polymorphism (SNP), near the LCT gene, is associated with a higher frequency of lactose tolerance in European adults and probably arose during the emergence of dairy farming (Gibson 2007; Tishkoff et al. 2007; Kelley and Swanson 2008; Ingram et al. 2009).
For each model, we introduced all remaining neighbourhood covariates neighbourhood victimization, frequency of violence, tolerance of fighting and police responsiveness to the neighbourhood-level intercept and adolescent violence slope equations (i.e. we added cross-level interactions between each neighbourhood variable and adolescent violence).
The significant GxP interaction, higher response to direct selection under –P conditions and the low frequency of Al-tolerance in WA sorghum, indicate the need for selection efforts specifically targeting P-limited and high Al-saturation production environments.
The significant GxP interaction, higher response to direct selection under –P conditions [ 5] and the low frequency of Al-tolerance in WA sorghum, indicate the need for selection efforts specifically targeting P-limited and high Al-saturation production environments, which are of major importance for WA sorghum producers.
Here we show that exposure of Arabidopsis plants to various abiotic stresses results in substantial transgenerational increases in the frequency of HFR, higher tolerance to stress, and global hypermethylation of the genome.
Frequency of impaired glucose tolerance and diabetes is already high in transplant populations.
All educators received home visits from scheme staff; however, there was variation in educator preference of the frequency of visits and tolerance of unplanned 'spot check' visits.
At OGTT, GCK patients showed a higher frequency of impaired glucose tolerance and a lower frequency of diabetes than HNF1A patients (Table 1).
