Vertebrate limb, Biology

Assignment Help:

Vertebrate Limb

Earlier we know that how a series of sequential and coordinated interactions between different cell groups and tissues carry about the construction of a complex organ, the vertebrate eye. In this we will study the development of other complex organ, the vertebrate limb. The paired limbs of all tetrapod vertebrates are made on a common basic pattern, develop in similar manner from cells derived from identical sources in the embryo and, hence, they are all homologous structures. An extremely large number of descriptive and experimental studies have been done on development in vertebrates throughout the present century.

At first the work was done mostly on amphibian embryos but later the chick has been chosen for, among other reasons, the chick embryos are large, easily accessible and obtainable throughout the year. As recently much experimental work has been done on the development of wing of chick embryos. The wing bud is comparatively a large structure and can be manipulated in several ways by the investigator. Portions of the bud can be cut out and their development studied through grafting them in the same or different embryos or on chorioallantoic membrane of older chick embryos. Its mesodermal and ectodermal components can be separated from each other by treatment along with some chemicals like trypsin, EDTA etc or microsurgery and then they can be reassembled readily in different combinations. The two components of such type of synthesized buds can be from the same or different limb types, from embryos of similar or different stages, of the same or different species. The development of such types of combinations can be studied by grafting them on embryos or chorioallantoic membrane or culturing them in vitro. Much of our understanding about the mechanisms involved in limb development has come from investigations on such studies on chick embryos.


Related Discussions:- Vertebrate limb

Explain phenotypical characteristics of alleles of a gene, What are few exa...

What are few examples of phenotypical characteristics that present two or more varieties and of phenotypical features that do not vary? In relation to the genes correspondent to th

Pulmonary artery diastolic pressure, PADP may be determined by measuring th...

PADP may be determined by measuring the end diastolic velocity of PADP = 4 V 2 Pulmonary regurgitant signal and applying the following formula V is  the end diastolic veloci

What is the function of the plant cell wall, Ans) The plant cell wall has s...

Ans) The plant cell wall has structural and protective functions. It plays significant role in the constraint of the cell size, preventing the cell to break when it absorbs much wa

Phases divided photosynthesis, Q. What are the phases into which photosynth...

Q. What are the phases into which photosynthesis is divided? Photosynthesis is divided into the photochemical phase or light reactions and the chemical stage.

Management and nutritional intervention using mna, Define Management and Nu...

Define Management and Nutritional Intervention using MNA - Undernutrition? A. For those categorized as well-nourished They need only be reminded of the importance

Auxins - plant growth substances, Auxins - Plant Growth Substances Jul...

Auxins - Plant Growth Substances Julius Sachs (1882) first suggested on the basis of his observations that there are special substances for forming roots and some special subs

Cleft grafting, Cleft grafting  The stem of the stock is cut across....

Cleft grafting  The stem of the stock is cut across. A 'V' shaped insertion is made at the end of the stock. The scion is cut in shape. The scion is inserted into the 'V'

List some points to keep in mind while counselling, Q. List some points to ...

Q. List some points to keep in mind while counselling? 1. Judgment Do not be judgemental. Be a patient listener. Assess and make decision. 2. Patience and Acceptance

Incubator, Incubator The incubators are essential to provide an ideal ...

Incubator The incubators are essential to provide an ideal micro environment. The main functions are: isolation, maintenance of thermo neutral ambient temperature, desired h

Hemophilic man (xhy) and nonhemophilic noncarrier (xx), Is it possible for ...

Is it possible for any son of a couple formed by a hemophilic man (XhY) and a nonhemophilic noncarrier (XX) woman to be hemophilic? If the mothers are not affected by the disea

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