Segmentation in regenerating annelids, Biology

Segmentation in Regenerating Annelids

Several worms as they grow continue to add new segments at the posterior end. In these, segmentation takes place in a growth zone located immediately anterior to the terminal pygidium. It is in this region which extra segments are partitioned off from time to time by the development of new septa. Caudal regeneration recapitulates this common mode of growth in annelids. There is no growth zone at the anterior end to give for increase in segments anteriorly during normal ontogeny. Thus in the - regenerating head, certain number of inter segmental septa are formed at the same time, delimiting certain number of segments. This is why the power of regeneration of anterior segments is usually less than that of the posterior segments.

Posted Date: 1/31/2013 6:12:49 AM | Location : United States







Related Discussions:- Segmentation in regenerating annelids, Assignment Help, Ask Question on Segmentation in regenerating annelids, Get Answer, Expert's Help, Segmentation in regenerating annelids Discussions

Write discussion on Segmentation in regenerating annelids
Your posts are moderated
Related Questions
Explain the DNA Hybridisation? This technique is used to study or compare the genetic affinity between two organism. In such studies the deoxyribonucleic acid (DNA) of both org


What is Sodium Bicarbonate? The administration of bicarbonate may be considered if the pH remains below 7.1 or if hyperkalemia or tricyclic antidepressant overdose is suspected

newer trends of animal taxonomy

Determine the stages of healing events The healing events are described in 3 stages Stage 1: Wound healing and formation of woven bone (callus) (2 to 6 weeks) Stage 2: La

C o n t a g i o u s bovine pleuropneumonia It is a disease of bovines characterized by high rise of body temperature and difficulty in respiration. E t iolo

How to Recognition of Congenital Heart Disease ? The manifestations of CE-ID are different in a neonate, an infant or a child. It is often easy to recognise the presence of CHD

Define about the nutritional deficiencies? The nutritional deficiencies which have been identified in the group of elderly are of total calories, protein, vitamin A, vitamin C,

Pyruvate Pyruvate has three different  fates. Under aerobic conditions,  pyruvate enters mitochondriaand is converted to acetyl CoA. The acetyl CoA enters thecitric acid cycle.

Explain in details Amino Acid? Amino Acids :   There are 20 common amino acids, with a few more found in lower organisms. Adult humans require a diet that includes at least 8