| − | '''Deletion''' is a particular kind of mutation: loss of a piece of [[DNA]] from a [[chromosome]]. Deletion of a gene or part of a gene can lead to a disease or abnormality. | + | '''Deletion''' is a particular kind of mutation: loss of a piece of [[DNA]] from a [[chromosome]]. Deletion of a gene or part of a gene can lead to a disease or abnormality. It can also rarely be a favorable mutation. |