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 ...
Duplication
Duplication is a type of mutation that involves the production of one or more copies of a gene or region of a chromosome. Gene and chromosome duplications occur in all organisms, though they are especially prominent among plants.
Gene duplication occurs when an error in DNA replication leads to the duplication of a region of DNA containing a (generally functional) gene.
Gene duplication
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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.
Duplications
Duplications are a doubling of a section of the genome.
duplication An extra copy of a chromosome segment without altering the number of chromosomes.
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.
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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.
Gene duplication Duplication of a gene in the process of replication. One of the duplication products may accumulate mutations and eventually evolve into a gene with a different but related function.
Duplication
The repetition of a sequence of chromomeres or other chromosome segment, usually in linear juxtaposition to the original.
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.
A form of duplication using only mitosis.
Example, a new plant grows out of the root or a shoot from an existing plant.
Produces only genetically identical offspring since all divisions are by mitosis.
Chromosome duplication is a force that drives evolution. We now suggest that this may also be true of the primates and that the resulting duplications in part determine the spectrum of human chromosomal rearrangements.
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).
Each valve is formed by a reduplication of the inner coat, strengthened by connective tissue and elastic fibers, and is covered on both surfaces with endothelium, the arrangement of which differs on the two surfaces.
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.
The final, irreversible step in the duplication and distribution of genomes to daughter cells takes place when chromosomes split at the metaphase-toanaphase transition.
During interphase of an animal cell, the centrioles and other components of the centrosome are duplicated, though scientists are not yet sure how this duplication takes place.
Chromosome abnormalities include inversion, insertion, duplication, and deletion. These are types of mutations. Since DNA is information, and information typically has a beginning point, an inversion would produce an inactive or altered protein.
The big idea to remember is that mitosis is the simple duplication of a cell and all of its parts. It duplicates its DNA and the two new cells (daughter cells) have the same pieces and genetic code. Two identical copies come from one original.
A locus in two species is said to be paralogous when it has arisen by gene duplication in one species. Cf orthology.
For example, gene B1, which has arisen by gene duplication in species 2, is paralogous to gene B in species 1.
In a reciprocal translocation heterozygote during meiosis the segregation of a translocated and a normal chromosome together, giving unbalanced gametes with duplications and deficiencies leading to non-viable zygotes.
replication In genetics, the duplication of one or more DNA molecules from the preexisting molecule.
Repolarization Return of a neuron to a resting potential.
The combination of domains in a single protein determines its overall function.
Double helix The shape that two linear strands of DNA assume when bonded together.
Duplication Duplication of a sequnece of DNA or section of chromosome.
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.
Actually, mitosis refers to the duplication of the genetic material and the subsequent distribution of exact copies to two new cells. The division of the cytoplasm is called cytokinesis.
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.
Gene family A number of genes which resemble each other in DNA sequence, presumably because they have evolved by gene duplication and subsequent divergence.
Gene flow The movement of alleles from one population into another.
 See also: Organ, DNA, Human, Chromosome, Gene
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