资料来源 : pyDict

变化,转变,母音变化

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Mutation \Mu*ta"tion\, n. [L. mutatio, fr. mutare to change: cf.
   F. mutation. See {Mutable}.]
   Change; alteration, either in form or qualities.

         The vicissitude or mutations in the superior globe are
         no fit matter for this present argument. --Bacon.

Mutation \Mu*ta"tion\, n.
   1. (Biol.) Gradual definitely tending variation, such as may
      be observed in a group of organisms in the fossils of
      successive geological levels.

   2. (Biol.)
      (a) As now employed (first by de Vries), a sudden
          variation (the offspring differing from its parents in
          some well-marked character or characters) as
          distinguished from a gradual variations in which the
          new characters become fully developed only in the
          course of many generations. The occurrence of
          mutations, and the hereditary transmission, under some
          conditions, of the characters so appearing, are
          well-established facts; whether the process has played
          an important part in the evolution of the existing
          species and other groups of organisms is a disputed
          question.
      (b) The result of the above process; a suddenly produced
          variation.

资料来源 : WordNet®

mutation
     n 1: (biology) an organism that has characteristics resulting
          from chromosomal alteration [syn: {mutant}, {variation},
           {sport}]
     2: (genetics) any event that changes genetic structure; any
        alteration in the inherited nucleic acid sequence of the
        genotype of an organism [syn: {genetic mutation}, {chromosomal
        mutation}]
     3: a change or alteration in form or qualities