| 释义 |
point mutation
point mutationn. A mutation that changes one nucleotide in a gene or DNA sequence by substitution, deletion, or addition.Thesaurus| Noun | 1. | point mutation - (genetics) a mutation due to an intramolecular reorganization of a genegene mutationgenetic science, genetics - the branch of biology that studies heredity and variation in organismschromosomal mutation, genetic mutation, mutation - (genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism |
Translations
point mutation
point mutation[′pȯint myü′tā·shən] (genetics) Mutation of a single gene due to addition, loss, replacement, or change of sequence in one or more base pairs of the deoxyribonucleic acid of that gene. point mutation
mutation [mu-ta´shun] 1. a permanent transmissible change in the genetic material.2. an individual exhibiting such a change.point mutation a mutation resulting from a change in a single base pair in the DNA molecule.somatic mutation a genetic mutation occurring in a somatic cell, providing the basis for mosaicism.suppressor mutation the correction of the effect of a mutation at one locus by a mutation at another locus.point mu·ta·tiona mutation that involves a single nucleotide; it may consist of loss of a nucleotide, substitution of one nucleotide for another, or the insertion of an additional nucleotide.point mutationn. A mutation that changes one nucleotide in a gene or DNA sequence by substitution, deletion, or addition.point mu·ta·tion (poynt myū-tā'shŭn) A mutation that involves a single nucleotide; it may consist of loss of a nucleotide, substitution of one nucleotide for another, or the insertion of an additional nucleotide. point mutation The replacement of one NUCLEOTIDE with another. This need not necessarily cause any change in the protein produced by the affected gene because 18 of the 20 amino acids have more than one coding triplet of base pairs (codon). Glycine, for instance, is coded for by GGA, GGU, GGG and GGC. This redundancy feature of the genetic code arises because the four bases, taken three at a time, allow 64 triplets to code the 20 amino acids and the three stop codons. It is called degeneracy.point mutation or gene mutation a genetic change affecting a single LOCUS, producing an alternative ALLELE of the gene, but not a gross structural change to the chromosome. The genetic change consists of an altered sequence of DNA bases, which can be of three main types: - (a) a SUBSTITUTION MUTATION,
- (b) a DELETION MUTATION and
- (c) an INSERTION MUTATION, the latter two often causing a major change to the amino acid sequence of the protein structure. Compare CHROMOSOMAL MUTATION.
LegalSeeMutationpoint mutation
Related to point mutation: Insertion mutation, Deletion mutationSynonyms for point mutationnoun (genetics) a mutation due to an intramolecular reorganization of a geneSynonymsRelated Words- genetic science
- genetics
- chromosomal mutation
- genetic mutation
- mutation
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