Autotomy and regeneration, Biology

Autotomy and Regeneration

Shedding of body parts in self-defense to avert the attention of the predator-enemy or in any other emergency is a type of autotomy (auto: self, tomy: cutting). The most familiar example of autotomy is a breaking off of the tail in the common house lizard between the chordates, but the phenomenon is far much more common among the non-chordates. You have already seen that this takes place is many echinoderms. The star fishes and brittle stars can cast off their arms that can regenerate into whole animals. An extremely interesting case of autotomy followed by regeneration is found in a polychaete annelid worm termed as Chaetopterus. It lives permanently inside a U-shaped parchment tube in the muddy bottom in shallow sea water. If the anterior end of this worm is pulled by a predator a constriction between 12th and 13th segments breaks the body into two pieces. The worm loses its head region to enemy whereas the remaining hind portion is left behind in the U- tube. This hind portion contains the gonads and regenerates the front part needed for normal feeding activity. Chaetopterus has been found to have a remarkable power of regenerating a complete worm from a single isolated body segment that is segment 14.

Posted Date: 2/5/2013 12:45:25 AM | Location : United States







Related Discussions:- Autotomy and regeneration, Assignment Help, Ask Question on Autotomy and regeneration, Get Answer, Expert's Help, Autotomy and regeneration Discussions

Write discussion on Autotomy and regeneration
Your posts are moderated
Related Questions
Islet of Langerhans: They are insulin-producing tissues. It was discovered by Paul Langerhans in 1869. These cells are in groups and look like islands in the pancreas. There are ab

Birth of Genetics Modern genetics originated with Gregor Mendel's work. It is based on this paper entitled "Experiments in Plant Hybridisation " published in 1866 inqthe Procee

Explain Properties of Natural fats and oils Natural fats and oils vary widely in their physical properties even though they are composed of the same or similar fatty acids. Th

SPINAL NERVES 31 Pairs. Mixed type. Total weight 150 gms. At the base of origin of spinal nerves gland of swammardon or calcarious ganglion is present. Composed of m

How to make and why one needs to make cDNA library??

Toxoplasma gondii Another well known Sporozoan is Toxoplasma gondii which has an unusually wide host- range for n protozoan parasite. It can probably infect all warm-blooded a

Plot the data as a suitable graph. Join the points with the best-fitting smooth curve.Temperature oC(5,10,11,13,17,19) Time taken for eggs to hatch/h 230 90 70 30 25

Bile salts or bile acids are polar derivatives of constitute and cholesterol the major pathway for the excretion of cholesterol in mammals.  In the liver, the cholesterol is circul

Describe the procedures involved in blood doping. What are the physiological mechanisms behind blood doping that attempt to achieve the desired outcome(s).

What is signifying by "gene locus"? The Gene locus (locus means place) is the location of a gene in a chromosome that is the position of the gene in a DNA molecule