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1. a doubling; in genetics, the presence of an extra segment of chromosome. See also repeat.
2. the process of copying a radiograph.
3. abnormal doubling of a body part.


1. A doubling.
See also: reduplication.
2. Inclusion of two copies of the same genetic material in a genome; an important step in diversification of genomes, as in the evolution of the (nonallelic) hemoglobin chains from a common ancestor. Synonym(s): gene duplication
[L. duplicatio, a doubling, fr. duplico, to double]


(do͞o′plĭ-kā′shən, dyo͞o′-)
a. The act or procedure of duplicating.
b. The condition of being duplicated.
2. Genetics
a. The occurrence of a repeated section of genetic material in a chromosome.
b. The formation of such a duplication.


1. A doubling.
See also: reduplication
2. genetics Inclusion of two copies of the same genetic material in a genome; an important step in diversification of genomes, as in the evolution of the (nonallelic) hemoglobin chains from a common ancestor.
[L. duplicatio, a doubling, fr. duplico, to double]


1. A doubling.
[L. duplicatio, a doubling, fr. duplico, to double]

Patient discussion about duplication

Q. what is the cause for double vision

A. Double vision, or diplopia, as it's called, may be due to many conditions, including disorders of the muscles of the eye (extra-ocular muscles) and the nerves controlling them, disorders of the eye ball (enlarged eyeball as in Graves' ), and sometimes disorders of vision.

Diplopia may manifest important conditions, so consulting a doctor (e.g. neurologist or ophthalmologist) may be wise.

You may read more here:

Q. I have fibromyalgia and am having terrible vision problems...double, blurred, feel off blance.Is this common?

A. Blurry vision is not a usual symptom in fibromyalgia. If you are experiencing this on a permenant basis you should see a doctor- either a neurologist or an ophthalmologist to rule out other vision conditions that might be causing this.

More discussions about duplication
References in periodicals archive ?
Vertebrate vitellogenin gene duplication in relation to the "3R hypothesis": correlation to the pelagic egg and the oceanic radiation of teleosts.
Eukaryotic [beta]-hexosaminidases might be originated from common bacterial ancestor through multiple gene duplications. Bacteria and fungi clades mostly contain one gene for hexosaminidase in each species albeit few have two genes.
This high gene count is a consequence of an elevated rate of gene duplication resulting in tandem gene clusters.
A review of the distribution of CYP2D6 genotype among countries indicates a south/north gradient of CYP2D6 gene duplications, which indicate UM status.
On the other hand, we also cannot exclude the possibility that COMT gene duplications occurred prior to the divergence of the Brachypodium, rice, and sorghum genomes, and duplicate paralogs were then deleted in the rice and sorghum lineages, resulting in their different evolutionary fates.
This has been explained by different models of gene family evolution that explain the mechanism whereby gene copies created by gene duplications are maintained and diverge in functions (28).
In summary, the present method offers an accurate alternative to Southern blot and other methods described previously for 21OHD diagnosis and has the following advantages: (a) it requires only a small amount of DNA (50-100 ng); (b) it is neither time-consuming (2 h) nor laborious, and can analyze many samples simultaneously; and (c) it is effective in the detection of CYP21A2 gene duplication, which is one of its most important advantages (21, 23, 25).
They suggested that the ancestral opsin evolved from gene duplications into four opsins, as represented in chicken.
One way a new gene can arise is by a process called gene duplication. Gene duplication is a process where a single gene duplicates itself by a variety of mechanisms, giving birth to another gene with a similar DNA sequence.
Targeted gene duplication and disruption for analyzing quantitative genetic traits in mice.
(30) Philippe and Forterre (31) demonstrated that the phylogenies were highly confusing due to the combining effects of gene duplication, gene loss, lateral gene transfer, and tree reconstruction artifacts.
Detection of these CYP2D6 polymorphisms results in the identification of 33 unique alleles, including seven CYP2D6 gene duplication alleles.