|occurrence of a chromosomal segment more than twice in a diploid cell or organism|
|replicated in short 5'3 strands stretches OKAZAKI fragments|
|1.||the act or process of mutating; change; alteration|
|2.||a change or alteration|
|3.||See also inversion a change in the chromosomes or genes of a cell. When this change occurs in the gametes the structure and development of the resultant offspring may be affected|
|4.||another word for mutant|
|5.||a physical characteristic of an individual resulting from this type of chromosomal change|
|a. (in Germanic languages) another name for umlaut|
|b. (in Celtic languages) a phonetic change in certain initial consonants caused by a preceding word|
mutation mu·ta·tion (my&oomacr;-tā'shən)
The act or process of being altered or changed.
An alteration or change, as in nature, form, or quality.
A sudden structural change within a gene or chromosome of an organism resulting in the creation of a new character or trait not found in the parental type.
The process by which such a sudden structural change occurs, either through an alteration in the nucleotide sequence of the DNA coding for a gene or through a change in the physical arrangement of a chromosome.
|mutation (my-tā'shən) Pronunciation Key
A change in the structure of the genes or chromosomes of an organism. Mutations occurring in the reproductive cells, such as an egg or sperm, can be passed from one generation to the next. Most mutations occur in junk DNA and have no discernible effects on the survivability of an organism. Of the remaining mutations, the majority have harmful effects, while a minority can increase an organism's ability to survive. A mutation that benefits a species may evolve by means of natural selection into a trait shared by some or all members of the species. See Note at cell anemia">sickle cell anemia.