FIGURE 12-24 Mutations were used to identify genes that suppress, Su(var), or enhance, Eſvar), position-effect variegation. Some gene products enhance or suppress the spread of heterochromatin Second-site mutations that affect the spreading of heterochromatin Drosophila eye (translocated white*) E(var) Spreading enhanced. More white are silenced. Spreading suppressed. Fewer white are silenced. Su(var)

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.