After a thousand generations task partitioning begins to emerge and the cooperative behavior is optimized and refined over an additional thousand generations.
Repeated backcrossing to the recipient DA strain was performed for an additional nine generations to create congenics with theoretically <0.1% of the donor genome outside the Vra1 locus.
While this was qualitatively different from that seen in the previous trials with non-tetracycline-treated flies, a further trial with these lines after an additional five generations on normal food, revealed more similar data to that shown in Figure 3 (data not shown).
Following generation 5, harvesting was applied randomly to all treatments for an additional five generations (Conover et al. 2009).
Individuals from this mixed population were kindly shared by Dr. Aaron Gassmann and were selected in the laboratory for Cry3Bb1 resistance and nondiapausing development for an additional five generations to create a nondiapausing, Cry3Bb1-resistant population (HopR).
Incorporation of modern wolf samples after the population recovery in 1995 extended our sampling interval with additional five generations, but did not significantly change the magnitude of the estimates of any of the used methods.
Conover et al. (2009b) filled this empirical gap by extending the Menidia experiment for an additional five generations during which size selection at harvest was relaxed across all lines.
The pedigree structure of the 315 phenotyped dogs and an additional one generation of 63 unphenotyped and 1 phenotyped ancestors (64 dogs) was used in the segregation analysis and is given in Figure S1.
These nine genes included the three groups of non-additively expressed genes, that is, stochastic, heritable and persistent and, therefore, 28 comparisons for non-additivity were generated across the two lines and the two generations (see Additional file 7).
The authors also showed that H3K9me3 at the target locus persisted for two generations without any additional input of dsRNA, while the level of small RNAs rapidly dropped after the first generation, consistent with small RNAs bringing about histone modifications.
