Duplication

duplication
The occurrence of a chromosomal segment more than twice in a diploid cell or organism.
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Gene duplication occurs when an error in DNA replication leads to the duplication of a region of DNA containing a (generally functional) gene.
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Dr. William Pavan, of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines duplication.
illustrated:
View illustration ...
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Duplications
Translocations
Frequency of Mutations
Some Examples
Measuring Mutation Rate
Males Contribute More Mutations Than Females
Somatic vs. Germline Mutations ...
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Duplication
The repetition of a sequence of chromomeres or other chromosome segment, usually in linear juxtaposition to the original.
Inversion ...
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Duplication
A region of DNA that is present in two copies. The DNA is present as an adjacent, direct repeat in tandem duplications. It is also possible for the duplicated DNA to be present at distant sites on a chromosome.
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duplication An extra copy of a chromosome segment without altering the number of chromosomes.
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Duplication
A chromosome segment that is repeated is called a duplication.
It can be due to unequal crossing over which produces a deletion on one chromosome and a duplication on the other.
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duplication
An aberration in chromosome structure resulting from an error in meiosis or mutagens; duplication of a portion of a chromosome resulting from fusion with a fragment from a homologous chromosome.
dynein ...
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Duplication of a portion of chromosome 21
Rarely, a region of chromosome 21 will undergo a duplication event. This will lead to extra copies of some, but not all, of the genes on chromosome 21 (46,XX,dup(21q)).
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Gene duplication occurs frequently in complex genomes; sometimes the duplicated copies degenerate to the point where they no longer are capable of encoding a protein.
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Gene duplication is important because it is a way to get new genes. Once a gene has been duplicated one copy can change while the other remains the same.
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The reduction division process by which haploid gametes and spores are formed, consisting of a single duplication of the genetic material followed by two mitotic divisions. Messenger RNA (mRNA).
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Margaret Dayhoff proposed an ingenious solution to this rooting dilemma: using ancestral genes that are present in multiple copies in the same organism because of gene duplication.
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Novelty may arise through several methods including gene duplication and gene regulation. Gene duplication allows fixation of a particular cellular or biochemical function at one locus, leaving the duplicated locus free to fulfill a new function.
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P elements are typical transposable elements , containing terminal inverted repeats and creating target site duplications on transposition. Autonomous P elements encode a protein which is probably the transposase.
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Wg mutants have a complete loss of all wing structures replaced by a tiny duplication of notal structures (Sharma, 1976; Morata, 1978) ...
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replication In genetics, the duplication of one or more DNA molecules from the preexisting molecule.
Repolarization Return of a neuron to a resting potential.
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Semiconservative replication. During DNA duplication, each strand of a parent DNA molecule is a template for the synthesis of its new complementary strand. Thus, one half of a preexisting DNA molecule is conserved during each round of replication.
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Pseudogene
A gene copy created by a gene duplication event that is no longer functional due to a disabling mutation.
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PSEUDOGENE - Inactive but stable components of the genome which derived by duplication and mutation of an ancestral, active gene. Pseudogenes can serve as the donor sequence in gene conversion events.
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