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Dictionary » M » Mosaic

Mosaic

Definition

(general)

(1) A pattern consisting of numerous small pieces (or elements) fitted together.

(2) Anything that resembles such a pattern, as in fluid mosaic model of cell membranes.

(genetics) Mosaicism, or the organism exhibiting mosaicism, which is the occurrence of two or more cell populations with different genotypes in an individual.

(botany) A mosaic disease: a viral disease of ornamental and crop plants characterized by mottling and discoloration of leaves.

(ecology) A habitat mosaic: a pattern of interspersed ecosystem of similar size and on a recurring basis.


Supplement

In genetics, a mosaic or mosaicism refers to the presence of two (or more) populations of cells, each with different genotypes in an individual. It may be a gonadal mosaicism or tissue mosaicism. An example of mosaicism is 46/47 XY/XXY mosaic.


Word origin: Middle English musycke, from Old French mosaique, from Old Italian mosaico, from Medieval Latin mūsāicum, neuter of mūsāicus, of the Muses, from Latin Mūsa, Muse, from Greek Mousa.

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Molecular gene (genome) concept scientifically untenable

... usage is a genome strategy modulated for gene expressivity. Nucleic Acids Res. 9:43-47. 16. Rosenfeld, A. 1981. Master molecule heal thyself. Mosaic 12(1). 17. Portin, P. 1993. The concept of the gene: Short history and present status. The Quarterly Review of Biology 68:173-223. 18. Fogle, ...

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by PAWahid
Wed May 02, 2012 4:54 am
 
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 11392

Theories - Origin of Life

... in the study of speciation. That is, speciation might often involve multiple and shifting geographic contexts and mechanistic drivers. This mosaic nature of speciation has also been suggested to characterize other taxa...and it might even be reasonably common in nature. The solution to Darwin’s ...

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by AstraSequi
Tue Mar 27, 2012 2:41 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 548
Views: 534370

Re: Theories - Origin of Life

... in the study of speciation. That is, speciation might often involve multiple and shifting geographic contexts and mechanistic drivers. This mosaic nature of speciation has also been suggested to characterize other taxa (Feder et al., 2005; Rundle & Nosil, 2005; Mallet, 2008; Nosil et ...

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by scottie
Tue Mar 13, 2012 3:12 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 548
Views: 534370

Re:

... of the phospholipids as well as integral proteins (hydrophilic channels, peripheral proteins etc) are exposed to cytoplasm/tissue fluid. See fluid mosaic model; http://www.infoplease.com/images/cig/biology/02fig01.png

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by Squirrell
Thu Feb 16, 2012 8:59 pm
 
Forum: General Discussion
Topic: Please Help with Homework (fairly easy questions)
Replies: 6
Views: 15469

Re: Theories - Origin of Life

... isochore r egions, each with a distinctive species specific base composition. Therefore to view the genome without reference to it’s isochore mosaic would be like describing, say, the Colorado River without any reference to the Grand Canyon, or the Grand Canyon National Park, Colorado desert ...

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by scottie
Tue Jan 03, 2012 12:15 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 548
Views: 534370
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