A mutation is any heritable change in the genome of an organism. For a population, heritable mutations provide the source of genetic variation, without which evolution could not occur: If all individuals of a species were genetically identical, every...

Mutagenesis is the process of inducing mutations. Mutations may occur due to exposure to natural mutagens such as ultraviolet (UV) light, to industrial or environmental mutagens such as benzene or asbestos, or by deliberate mutagenesis for purposes of...

Genetic variation in a population describes the existence in that population of different alleles, or alternative forms, for a given gene. The presence of genetic variation implies that individuals of the population vary in the alleles they possess,...

A mutation is a sudden change in DNA (deoxyribonucleic acid), the genetic material of life. Mutation is a major evolutionary force that results from wide range of factors and that carries a wide range of results. Mutations may carry no discernable...

In a strict sense, mutations are changes in genes not caused by genetic recombination. A change in the base sequence of DNA, for example, represents a mutational change. Spontaneous mutations are mutations that occur at a given frequency without the...

A mutation is an abrupt change in genes or chromosomes that affects an organism morphologically. Mutations can occur spontaneously or be induced by environmental factors, and, on occasion, they can even occur as the result of a change in chemistry...

Strong paleontological and molecular evidence indicates that life first appeared on Earth about four billions years ago, in the form of prokaryotes, or non-nucleated unicellular organisms, such as archaea and bacteria. Comparative genetic studies of...

A mutation is any change in genetic material that is passed on to the next generation. The process of acquiring change in genetic material forms the fundamental underpinning of evolution. Mutation is the source of genetic variation in humans and other...

Amber, ocher and opal mutations are specific types of nonsense mutations that result in production of protein chain terminating codons that prematurely stop protein synthesis during translation. Instead of the proper amino acid being inserted into the...

Mutations are caused by DNA damage and genetic alterations that may occur spontaneously at a very low rate. The frequency of these mutations can be increased by using special agents called mutagens. Ionizing radiation was the first mutagen that...

A mutation is any change in genetic material that is passed on to the next generation. The process of acquiring change in genetic material forms the fundamental underpinning of evolution. Mutation is a source of genetic variation in all life forms....

In general, deoxyribonucleic acid, or DNA, is a very stable molecule. As it conveys genetic information from one generation to the next, errors rarely occur; however, they are not totally absent. Alterations in the DNA are called mutations. Mutations...

Mutations are caused by DNA damage and genetic alterations that may occur spontaneously at a very low rate. The frequency of these mutations can be increased by using special agents called mutagens. Ionizing radiation was the first mutagen that...

A same-sense mutation is form of silent mutation where a change in the base sequence of a gene does not result in a change in the amino acid sequence of the protein for which the gene carries the genetic instructions. Because the genetic code contains...

Mutation is an alteration in an organism's genes. The mutation is carried to the organism's offspring, so the offspring may look or act different from its ancestors. Mutations may be beneficial or harmful, or they may have no noticeable effect at all....

A mutation is a change in the DNA of an organism, which is genetically transmitted, and may give rise to a heritable variation. Mutagens, substances that have the competence to produce a mutation, may be subject to chromosomal changes such as...

The interaction of certain environmental chemical compounds and cell metabolism may result in genetic changes in DNA structure, affecting one or more genes. These chemical-induced mutations are known as chemical mutagenesis. Most cancers and other...

The interaction of certain environmental chemical compounds and cell metabolism may result in genetic changes in DNA structure, affecting one or more genes. These chemical-induced mutations are known as chemical mutagenesis. Many cancers and other...

Mutations and reversions are events that change the expression of traits of an organism. They change the organism's phenotype. The change can result from a change in a base--a constituent of the deoxyribonucleic acid--or a change in one of the amino...

Mutagenesis is the induction of genetic change in a cell by the alteration of DNA. The change or alteration is heritable in cell progeny and is almost always detrimental. While most mutations are indeed detrimental, it is well to remember that...

Gene mutation is a sudden change in the DNA making up an individual gene. Gene mutation is a fairly infrequent event, although its occurrence can be speeded up by the action of radiation or of certain chemicals (termed mutagens). Within a gene, the...

Discontinuous variation is variation within a population of a characteristic that falls into two or more discrete classes. Classic examples include such things as eye color in animals and the tall and short pea phenotypes used by Austrian botanist...

Alteration in the genetic material of a cell that is transmitted to the cell's offspring. Mutations may be spontaneous or induced by outside factors (mutagens). They take place in the genes, occurring when one base is substituted for another in the...

n. (also provection) A rather sporadic phonological process in Welsh, in which a voiced plosive (or, less usually, a voiced fricative) is devoiced at a morpheme boundary in compound formation, or very rarely in certain other types of formation,...

A permanent change in the genetic material of the cell potentially leading to a change in the physical characterisation of the progeny of that organism on reproduction. Upon mutation the resultant DAUGHTER cells, following subsequent cell division,...

An alteration in a genetic sequence, caused by a change in the order of NUCLEOTIDES in a piece of DNA. Because DNA sequences are inherited between generations, mutations will also be inherited. FIONA...

(1) A gene that apparently has no end product, e.g., a specific antigenic determinant. Sometimes referred to as a silent gene. (2) A mutation that obliterates gene function; a null...

Any change in the sequence of genomic DNA. May result from one or many base pair changes. A change in a gene’s DNA sequence resulting in the formation of another...

For linguistic mutation, see Apophony. For the album by Beck, see Mutations (album). In biology, mutations are changes to the base pair sequence of the genetic material of an organism. Mutations can be caused by copying errors in the genetic material...