Competence of larval tissue or multiple responses, Biology

Competence of Larval Tissue or Multiple Responses

The responsiveness of different larval tissues to thyroxine is markedly different. The tissues of the tail becomes necrotic and undergo degeneration due to the action of the thyroid hormone, while the tissues of the limb increase and undergo differentiation. Furthermore thyroxine causes rapid aging and destruction of R.B.C's of the larva undergoing metamorphosis. In addition it stimulates the development of cells that synthesize the hemoglobin of adult frog. The hormone T3 reduces biosynthesis of nucleic acids in the tail but increases their synthesis in the liver. Furthermore, muscles of the tail undergo degeneration while those of the trunk remain unaffected. Such examples clearly indicate that the response and reactivity of larval tissue to the same hormone or agent differs greatly. In addition it can also be demonstrated experimentally that the reactivity and response of the target tissues are intrinsic, specific and independent. This can be demonstrated by transplanting tail tips of the tadpole to the trunk of another tadpole undergoing metamorphosis, or by placing the eye of the tadpole in the tail of a metamorphosing larva. The extra tail transplanted into the tadpole host trunk is not protected from degeneration and undergoes necrosis along with the host tail and gets absorbed. The eye retains its integrity despite the fact that it lies surrounded within the degenerating tail.

Posted Date: 1/30/2013 6:29:35 AM | Location : United States

Related Discussions:- Competence of larval tissue or multiple responses, Assignment Help, Ask Question on Competence of larval tissue or multiple responses, Get Answer, Expert's Help, Competence of larval tissue or multiple responses Discussions

Write discussion on Competence of larval tissue or multiple responses
Your posts are moderated
Related Questions
Q. What are the major proteins that constitute the sarcomere? What is the function of those molecules in the muscle cells? In the sarcomere there are organized myosin and actin

Rabies Rabies, a fatal zoonotic viral disease of dogs, cats, man and other mammals, causes an acute encephalomyelitis. The rabies virus belongs to the genus Lyssavirus in the

How does light intensity affect oxygen production?

Q. What is the intermediate host of Schistosoma mansoni? Where does that host live? The intermediate host of a schistosome is a gastropod mollusc, Biomphalaria genus and a snai

PGA as the first CO2 fixation product was discovered in photosynthesis of: 1. Bryophyte 2. Gymnosperm 3. Angiosperm 4. Alga Alga

A glycosidic bond would be present in: Select one: a. acetone. b. methyl-alpha-D-glucose. c. 2-deoxy-beta-D-ribose. d. glucose-6-phosphate. e. fructose-1, 6-bisphosp

What do you understand by Arthropodization? Many of the traits that we consider unique to the Arthropoda may not be independent traits. Instead, they may be the consequence of

Ask question importance of genetics in human life #Minimum 100 words accepted#

What are brief descriptions of how you could test hypothesis. or how would you know if your hypothesis is testable?

Q. What are the main functions of the cytoskeleton? As the name indicates, the cytoskeleton is accountable for the support of the normal shape of the cell it also acts as a fac