Vespolina Vespolina Vespolina is a red Italian wine grape variety that is planted in Piedmont around Gattinara and Ghemme. Ampelographer believe that the grape is most likely indigenous to this area of Piedmont and recent DNA profiling identified a parent-offspring relationship with Nebbiolo. Outside Piedmont it is found in the Lombardy region of Oltrepò Pavese where the grape is known as Ughetta. In Gattinara, Vespolina is sometimes blended with Nebbiolo and Bonarda Piemontese. Unlike the white Italian grape Vespaiolo, the root of the name Vespolina does not have a direct connection with "vespe" or wasp. However the true origins of the
Petite mutation Petite mutation petite (ρ–) is a mutant first discovered in the yeast "Saccharomyces cerevisiae". Due to the defect in the respiratory chain, 'petite' yeast are unable to grow on media containing only non-fermentable carbon sources (such as glycerol or ethanol) and form small colonies when grown in the presence of fermentable carbon sources (such as glucose). The petite phenotype can be caused by the absence of, or mutations in, mitochondrial DNA (termed "cytoplasmic Petites"), or by mutations in nuclear-encoded genes involved in oxidative phosphorylation. A neutral petite produces all wild type progeny when crossed with wild type. petite mutations can