Segmentation in regenerating annelids, Biology

Assignment Help:

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.


Related Discussions:- Segmentation in regenerating annelids

Define the enumeration of food microbiota, Define the Enumeration of Food M...

Define the Enumeration of Food Microbiota? Quality of food depends on its physical, chemical, microbiological and sensory quality. The examination of food for the type and numb

How can amine groups be classified, How can amine groups be classified? ...

How can amine groups be classified? Amines can be classify into primary amines, those to which one -R (variable radical) is attached to a -NH2, secondary amines, those where on

What is monohybridism, What is monohybridism? Monohybridism is the stud...

What is monohybridism? Monohybridism is the study of only one feature in the crossing of two pure individuals (hybridization) for that characteristic.

What is the estimated percentage of water in the human body, Q. What is the...

Q. What is the estimated percentage (in mass) of water in the human body? Is this percentage expected to be larger in the adult or in the old individual? Ans. Approximatel

What are the conventional signs used in genetic family trees, What are the ...

What are the main conventional symbols and signs used in genetic family trees? In genetic family trees the male sex is usually shown by a square and the female by a circle. Cro

Genomic dna libraries , A genomic DNA library is made from the genomic DNA ...

A genomic DNA library is made from the genomic DNA of an organism. For instance, a mouse genomic library could be made by digesting mouse nuclear DNA with a restriction nuclease to

Disorders of gonads, DISORDER S OF THE GONADS Hypogonadism. Inadequa...

DISORDER S OF THE GONADS Hypogonadism. Inadequate gonadal function is called hypogonadism. It is due to defects in, or injury to the hypothalamus, the pituitary gland, of th

Explain in detail about respiratory system, Explain in details about Respir...

Explain in details about Respiratory system Respiratory system starts from nostrils through which we inhale air in the nasal cavity. Then, air enters pharynx and goes through l

Explain precautions for gram staining of bacterial cultures, Explain Precau...

Explain Precautions for Gram Staining of Bacterial Cultures? 1. The dilutions should be chosen on the basis of expected counts in the food sample. 2. Food should be kept in

Define drug effects on vitamin and mineral metabolism, Define Drug effects ...

Define Drug effects on Vitamin and mineral metabolism? Vitamin and mineral metabolism: Micronutrients are required as cofactors or coenzymes in many metabolic pathways, includi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd