By Carolyn L. Driedger and William E. Scott, USGS -- Republished from USGS fact sheet 2008-3062. 1  Mount Rainier: The flat floor of the Puyallup River valley near Orting, Washington, is formed by deposits of the 500-year-old Electron lahar, which surged down from Mount Rainier (in background).
Substitution mutation. Definition. A type of point mutation in which a single nucleotide is substituted with (or exchanged for) a different nucleotide that may result in an altered sequence of amino acid during translation, which may render the newly synthesized protein ineffective.Supplement.n transversion, purine is substituted with pyrimidine or a pyrimidine with a purine. See also: point mutation. Please contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 16 October 2008, at 00:53.This page has been accessed 109,894 times.
A point mutation, or single base modification, is a type of mutation that causes a single nucleotide base change, insertion, or deletion of the genetic material, DNA or RNA.The term frameshift mutation indicates the addition or deletion of a base pair.A point mutant is an individual that is affected by a point mutation. Repeat induced point mutations are recurring point mutations, discussed below. Sometimes the term point mutation is used to describe insertions or deletions of a single base pair (which has more of an adverse effect on the synthesized protein due to the nucleotides' still being read in triplets, but in different frames: a mutation called a frameshift mutation).