Problem of polarity in regeneration in planarians, Biology

Problem of Polarity in Regeneration in Planarians

As in Hydra, flatworm regeneration as well appears to occur in a polar fashion. There seems to be ananterior-posterior gradient system as the cut anterior surface will make a head and the cut posterior surface will form a head. As in Hydra, middle pieces are able of regenerating both a head and a tail. Identical to the Hydra there is an exception to this rule, for if the middle piece is too thin as compared to the planarian segment will grow two heads.

It is believed that the anterior-posterior gradient is not efficiently delineated in such a small segment and that the piece cannot determine "Which end is up", as neither end of the segment has an advantage over the other. Evidence exists that the polarity gradient is due to metabolic activity and that the much more metabolically active end makes the head. Two-headed flatworms are so produced by removing anterior posterior metabolic gradient. It has also been observed that flatworms in addition to retaining anterior-posterior polarity can also regenerate the missing half if split longitudinally. It is believed that the pattern of planaria regeneration is similar to hydra as it also controlled by diffusible gradients.

Posted Date: 1/31/2013 5:49:40 AM | Location : United States







Related Discussions:- Problem of polarity in regeneration in planarians, Assignment Help, Ask Question on Problem of polarity in regeneration in planarians, Get Answer, Expert's Help, Problem of polarity in regeneration in planarians Discussions

Write discussion on Problem of polarity in regeneration in planarians
Your posts are moderated
Related Questions
How does the synthetic theory of evolution incorporate knowledge from Genetics and Molecular Biology into the darwinism? Today it is known as that variation of inherited charac

Membrane Perforation of sinus graft surgery it is the most common complication during the sinus graft surgery resulting from the scoring of lateral access window for surgery an

Properties of Stem Cells Stem cells are defined by having 3 major properties: 1) They are capable of self-renewal.  2) They divide, some daughter cells give rise to cells


Contig:  Number of uses, all nouns. The term comes from the shortening of the word 'contiguous'. A 'contig' might refer to the map showing placement of a set of clones which comple

Aeromonas associated zoonotic disease Aeromonas causes gastrointestinal infections and extra intestinal infections such as cellulitis, wound infectiopn, peritonitis, endocardi

Injury Resulting From an Accident Accident was described earlier which meant that accident was a sudden event. However, several legal opinions favored exclusion of suddenness

Explain Absorption and Metabolism of Minerals? All minerals in the diet are not equally absorbed. Also different compounds and complexes of same mineral are absorbed with diffe

Plant Responses to Light-Dark Cycles Based on their requirement for day length (number of hours of light) for flowering plants have been grouped under three major categories,

LYMPH - Lymph is a mobile connective tissue comprising lymph plasma (fluid) and lymphcorpuscles (cells).   COMPOSITIO N - (i )      Lymph Plasma - It is simil