Tempranillo shown no genetic connection between the cultivars. Spanish cultivation of "Vitis vinifera", the common ancestor of almost all vines in existence today, began in earnest with Phoenician settlement in the southern provinces. Later, according to the Roman writer Columella, wines were grown all over Spain; yet there are only scattered references to the name "Tempranillo". Ribera del Duero wine making extends back over 2,000 years, as evidenced by the 66-metre mosaic of Bacchus, the Roman god of wine, that was unearthed in 1972, at Baños de Valdearados. It is possible that this grape was introduced to the Western Hemisphere by
Petite mutation petite negative mutants. Potentially, these yeasts have a different inheritance system in place for their mitchondrial genome than "S. cerevisiae" does. The frequency at which "S. castellii" spontaneously produces petites is similar to that of "S. cerevisiae", with the mitochondrial DNA of those petites being highly altered via deletion and rearrangement. Suppressive petites of "S. cerevisiae" are the most commonly observed spontaneously created mutants, whereas in "S. castellii," the most commonly observed spontaneous mutant is the neutral petite, further leading to speculation that the transference of this mutation differs between species. Petite mutation petite (ρ–) is a mutant first discovered