Zinfandel Sirah), Carignan, Grenache, Mourvèdre, Mission and Muscat. While most vineyards are now fully segregated, California winemakers continue to use other grapes (particularly Petite Sirah) in their Zinfandel wines. Zinfandel is grown on approximately 11% of California's vineyard land area. Around 400,000 short tons (350,000 tonnes) are crushed each year, depending on the harvest, placing Zinfandel third behind Chardonnay and Cabernet Sauvignon and just ahead of Merlot. In California, 20% of the Zinfandel-growing counties hold 80% of the Zinfandel growing area; however, major producing areas such as San Joaquin County, Stanislaus County, and Madera County produce Zinfandel primarily for blends or
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