the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes.
regular change of a sound when it occurs adjacent to another, in particular.
1. The act or process of being altered or changed.
2. An alteration or change, as in nature, form or quality.
a. A change in the nucleotide sequence of the genome of an organism or virus, which sometimes results in the appearance of a new character or trait that is not found in the parental type.
b. The process by which such a change occurs, either through an alteration in the nucleotide sequence encoding a gene or through a change in the physical disposition of the genetic material.
c. The nucleotide sequence, trait or individual that results from such a change.
a. A change that affects a sound or a class of sounds, such as previous vowels or plosive consonants, by assimilating to another sound, as in the process of umlaut.
b. A change that affects a sound or a class of sounds that is conditioned by morphological or syntactic factors instead of purely phonological factors, such as in Irish, where certain words cause the indentation of the initial consonants of the next word.
[Middle English mutacioun ,
( mjuːteɪʃən )
1. (Genetics) the act or process of mutation; change; alteration
2. a change or alteration
3. (Genetics) a change in the chromosomes or genes of a cell. When this change in gametes occurs, the structure and development of the resulting offspring may be affected. See also investment 11
5. (Genetics) a physical characteristic of an individual that results from this type of chromosomal change
6. (Phonetics and phonology) phonetics
a. (in Germanic languages) another name for umlaut
b. (in Celtic languages) a phonetic change in certain initial consonants caused by a previous word
mu • ta • tion
(myuteɪ ʃən) n n n.
a. A sudden departure from the original type in one or more hereditary characteristics, caused by a change in a gene or chromosome.
b. an individual, species or similar that results from such departure.
2. the act or process of change.
3. a change or alteration, as in the form or nature.
4. a change in the sound of speech caused by assimilation to a nearby sound, esp. umlaut.
A change in the genes or chromosomes of an organism. Mutations that occur in reproductive cells, such as an egg or sperm, can be passed on from one generation to the next. Most mutations have harmful effects, but some can increase an organism's ability to survive. A mutation that benefits a species can evolve through natural selection in a trait shared by all members. See the note in sickle cell anemia .
of thrushes: group of molting birds.
1. Inheritable change in the DNA of a gene.
2. Change in a gene or genes of a living cell. A mutation in some way changes the characteristics of the cell and will be inherited. See chromosome , genes .