Dictionary » M » Mosaic egg

Mosaic egg

mosaic egg

(Science: biology) at one time a distinction was drawn between those organisms in which the egg seemed to have a firmly committed fate map built in and regulating embryos.

In the former, after the first cleavage one blastomere was committed to produce one set of tissues, the other blastomere a different set and removal of one blastomere led to the production of an incomplete embryo.

This was particularly obvious in mollusc development where one blastomere had the polar lobe material. This early differentiation (or determination) of blastomeres for particular fates was in distinction to regulating embryos in which the removal of one blastomere did not matter, the other blastomere compensating and producing a full set of tissues.

The distinction is, however, only based upon the timing of differentiative events and within a few divisions the regulating embryo also becomes a mosaic of determined cells.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Is it possible for humans to get cells like an electric ee

After all the eels got their cells from mutations in gene SCN4A Fish have a copy of their genome But this is possible in humans, called polyploidy (mosaic type) this can occur during cell division after birth, adult, etc... so some humans can have copies of SCN4A as well.

See entire post
by Coelacanth
Fri Feb 28, 2014 12:35 am
 
Forum: General Discussion
Topic: Is it possible for humans to get cells like an electric ee
Replies: 0
Views: 708

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, ...

See entire post
by PAWahid
Wed May 02, 2012 4:54 am
 
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 28991

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 ...

See entire post
by AstraSequi
Tue Mar 27, 2012 2:41 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 562
Views: 929149

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 ...

See entire post
by scottie
Tue Mar 13, 2012 3:12 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 562
Views: 929149

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

See entire post
by Squirrell
Thu Feb 16, 2012 8:59 pm
 
Forum: General Discussion
Topic: Please Help with Homework (fairly easy questions)
Replies: 6
Views: 38048
View all matching forum results

This page was last modified 21:16, 3 October 2005. This page has been accessed 1,730 times. 
What links here | Related changes | Permanent link