mosaic

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mosaic

 [mo-za´ik]
a pattern made of numerous small pieces fitted together; in genetics, occurrence in an individual of two or more cell populations each having a different chromosome complement.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

mo·sa·ic

(mō-zā'ik),
1. Inlaid; resembling inlaid work.
2. The juxtaposition in an organism of genetically different tissues; it may occur normally (as in lyonization, q.v.), or pathologically, as an occasional phenomenon. From somatic mutation (gene mosaicism), an anomaly of chromosome division resulting in two or more types of cells containing different numbers of chromosomes (chromosome mosaicism), or chimerism (cellular mosaicism).
[Mod. L. mosaicus, musaicus, pertaining to the Muses, artistic]
Farlex Partner Medical Dictionary © Farlex 2012

mosaic

(mō-zā′ĭk)
n.
Biology An individual exhibiting mosaicism.

mo·sa′i·cist (mō-zā′ĭ-sĭst) n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Referring to a sharply-defined tesselated patchwork of one ‘jig-saw’-shaped pattern imposed upon another of different color, tissue apearance or radiologic density
Genetics An individual with 2 or more genotypically or karyotypically distinct cell lines, arising from a single zygote by somatic mutation, crossing-over, or nondisjunction during mitotic division, an event more common in older mothers
Example Normal female mammal heterozygous for different alleles on the X chromosome; because of X chromosome inactivation, such females consist of two cell types, each with a different X chromosome inactivated, which results in a minor, epigenetic difference, in contrast to mosaic Turner syndrome in which some cells have no X chromosome at all
Gynaecology The mosaic pattern refers to vascular changes of interconnecting vessels resulting in a cobblestone or honeycomb surface appearance by colposcopy. Because the pattern is often associated with cervical intraepithelial neoplasia (CIN), a cervix with a mosaic pattern should be biopsied
Informatics A proprietary web browser (Mosaic), which was the first multiplatform browser for Macintosh, Windows, and UNIX. It was partially responsible for the Web’s explosive growth, but has long since faded into obscurity
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

mosaic

adjective A patchwork of one sharply-defined 'jig-saw'-shaped pattern imposed upon another of different color, tissue pattern or radiologic density noun Genetics An individual with 2 or more genotypically or karyotypically distinct cell lines, arising from a single zygote by somatic mutation, crossing-over, or nondisjunction during mitotic division. See Chimera, Freemartin Ob/Gyn A vascular change of interconnecting vessels resulting in a cobblestone or honeycomb surface appearance by colposcopy, the mosaic pattern is often associated with CIN and mandates biopsy.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

mo·sa·ic

(mō-zā'ik)
1. Inlaid; resembling inlaid work.
2. The juxtaposition in an organism of genetically different tissues; it may occur normally (as in lyonization, q.v.), or pathologically, as an occasional phenomenon.
[Mod. L. mosaicus, musaicus, pertaining to the Muses, artistic]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

mosaic

  1. any organism exhibiting a mixture of cells of different genetic makeup, such as a GYNANDROMORPH. See INACTIVE-X HYPOTHESIS. Plants showing this phenomenon are known as CHIMAERAS (1).
  2. a pattern of leaf-arrangement in a tree to maximize the exposure of the leaves to sunlight and thus the level of photosynthesis.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Mosaic

A term referring to a genetic situation, in which an individual's cells do not have the exact same composition of chromosomes. In Down syndrome, this may mean that some of the individual's cells have a normal 46 chromosomes, while other cells have an abnormal 47 chromosomes.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The mean performance of all genotypes across the six environments showed significant (P < 0.05) genetic variability for plant height, height at branching, and cassava mosaic disease severity score (Table 6).
The mosaic disease incidence usually increases during the dry seasons along with the increases of the insect vector populations.
Bhendi Yellow Vein Mosaic Disease in India is caused by association of a DNA beta satellite with a Begomovirus.
Cassava is undergoing GM research at Namulonge (near Kampala) to come up with varieties resistant to cassava mosaic disease and cassava brown streak disease.
Banana Chlorosis which have been variously described as infections chlorosis, heart rot, mosaic disease and virus sheath rot are now regarded as single disease and caused by strains of common virus the cucumber mosaic virus which is now have many alternative host plants and several aphids vectors.
CONOVER (1948) first recognized that soybean mosaic disease is caused by more than one strain of Soybean mosaic virus (SMV).
Among viral diseases, yellow mosaic disease has been considered as an important limiting factor in cucurbits productivity (Seshadri, 1996).
The mosaic disease in cucurbits was reported to cause by several viruses including members of genera Cucumo, Como, tobamo and potyvirus (Mukhopadhyay, 1985).
Among the virus diseases, Dolichos enation mosaic, leaf roll and Dolichos yellow mosaic disease have been reported to occur in India under field condition (Capoor and Verma, 1950).