Theory of embryology - gradient theory, Biology

Assignment Help:

GRADIENT THEORY -

It was given by T. Boveri & was supported by M.C. Child.

Child called it as metabolic axial gradient theory.

According to it, the egg has distinct animal & vegital poles.

The cytoplasm of the animal pole divides repidly but the rate of cleavage in the vegital pole is slow. It indicates that the rate of metabolism is more in the animal pole than the vegital pole which is called as metabolic axial gradient.

Horstadius & Runnstrom called it as double gradient thoery. They explain egg development on the basis of animal pole gradient & vegital pole gradient.


Related Discussions:- Theory of embryology - gradient theory

Describe about sex determination systems, Besides the XY system are there o...

Besides the XY system are there other sex determination systems? Some animals have a sex determination system dissimilar from the XY system. The X0 system is the sex determi

Which chemical elements are involved in most of matter, Q. Which chemical e...

Q. Which chemical elements are involved to form most of living biological matter? Ans The chemical elements that form most of the molecules of living beings are carbon (C)

Terminology use in apical dominance, Terminology use in Apical Dominance ...

Terminology use in Apical Dominance Here are a few terms that will be used in discussing apical dominance. A clear understanding of these terms is needed for understanding the

Explain spread plate method - pure culture techniques?, Explain Spread Plat...

Explain Spread Plate Method - Pure Culture Techniques? In this method, diluted microbial suspension containing about 30 to 300 colonies is spread uniformly on the agar surface

What is the difference between osmosis and diffusion, What is the differenc...

What is the difference between osmosis and diffusion? Osmosis is the occurrence of movement of solvent particles (in general, water) from a region of lower solute concentration

Chronic respiratory disease (crd), C h r on i c respiratory disease (C...

C h r on i c respiratory disease (CRD) Infection with Mycoplasma gallisepticum is characterized by slow onset; CRD is seen in chickens, turkeys, and other birds. Ducks f

Pathophysiology of bronchial asthma, Pathophysiology Asthma result fro...

Pathophysiology Asthma result from several physiological alterations, including altered immunologic response, increased airways resistance, increased lung-compliance, impaire

Photosynthesis - responses of plants to stress, Photosynthesis - Responses ...

Photosynthesis - Responses of Plants to Stress Photosynthesis is also inhibited due to low water potential in the leaves. The leaf water potential is the sum of turgor pressur

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