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Priya Lahorani posted an Question
February 17, 2022 • 20:41 pm
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30 points
30 points
- CSIR NET
- Life Sciences
What are the reasons for occurence of suppressive petite in yeast
what are the reasons for occurence of suppressive petite in yeast
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Priya sarda![best-answer]()
What is suppressive petite mutation? 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. 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 be induced using a variety of mutagens, including DNA intercalating agents, as well as chemicals that can interfere with DNA synthesis in growing cells.Mutagens that create Petites are implicated in increased rates of degenerative diseases and in the aging process.