Touraine AOC and from Sauvignon blanc and Arbois grapes. The white Touraine wines are dry, fairly firm, lively and full, and keep well when bottled. The sparkling wines are allowed to use the designation "Touraine mousse" (sparkling Touraine wine). Up to 20% of Chardonnay grapes may be included in the mixture of varieties grown. The red wines are produced from Cabernet Franc, Cabernet Sauvignon, Côt, Pinot noir, Pinot Meunier, Pinot gris, Pineau d'Aunis and Gamay grape varieties (Gamay is used only for wines marketed in the first year after production). These wines are flavoursome and tannic in character. Touraine wines sold in
Petite mutation and exhibit Mendelian 1:1 segregation. Neutral petites (rho–N): Neutral petite when crossed to wild-type, all offspring are wild-type. It has inherited normal mitochondrial DNA from wild-type parent, which is replicated in the offspring. Suppressive petites (rho–S): crosses between petite and wild-type, all offspring are petite, showing "dominant" behavior to suppress wild-type mitochondrial function. Most petite mutants of "S. cerevisiae" are of a suppressive type, and they differ from neutral petite by affecting the wild-type, although both are a mutation in mitochondrial DNA. Mitochondrial genome of yeast will be the first eukaryotic genome to be understood in terms of both structure