In molecular genetics, a point mutation is caused by the substitution of one nucleotide for another. In classical genetics, point mutation refers to any mutation that is not associated with a cytologically detectable chromosomal aberration or one that has no effect on crossing over.
a mutation that occurs when one base pair along a chain of DNA is changed, usually in an exon, or region coding for a protein. There are three types of point mutation: substitution, deletion, and insertion.
mutation that can be mapped to one specific site within a locus. A small mutation that consists of the replacement ( transition or transversion); addition; or deletion ( frameshift) of one or a few bases.
A mutation that results from a small, localized alteration in the chemical structure of a gene. Such mutations can give rise to wild-type revertants as a result of reverse mutation. In genetic crosses, a point mutation behaves as if it resided at a single point on the genetic map. (Contrast with deletion.)
(Also called cosmic ray mutations). This form of mutation is a random change from one instruction to another in the memory space of a creature. This can occur at any time and is not limited to whether the creature is executing a particular task, or even executing at all.
A point mutation, or substitution, is a type of mutation that causes the replacement of a single base nucleotide with another nucleotide. Often the term point mutation also includes insertions or deletions of a single base pair (which have more of an adverse effect on the synthesized protein due to nucleotides still being read in triplets, but in different frames- a mutation called a frameshift mutation).