Epiboly - mechanism of gastrulation, Biology

Assignment Help:

EPIBOLY -

The epibolic movements occur only in the prospective ectodermal blastomeres.
In the blastula of frog, migration and rearrangement of microceres over megameres is called epiboly.
At one specific point micromeres do not cover megameres, this place is known as gastrulation slit.
This slit is blastopore of future embryo. Formation of blastopores occurs in grey-crescent area.
Some megameres start budding as result of this budding micromeres are formed.
These micreomeres also cover the megameres. This process is known as Apiauxesic.
Example - In the eggs of Ctenophora, Mollusca, Annelida

Related Discussions:- Epiboly - mechanism of gastrulation

Epizootic lymphangitis, Epizootic lymphangitis Epizootic lymphangitis ...

Epizootic lymphangitis Epizootic lymphangitis (pseudo-glanders) is a chronic, insidious and highly contagious fungal disease of equines particularly horse and very rarely of c

Describe the symptoms of edema, Describe the clinical significance and symp...

Describe the clinical significance and symptoms of edema. How does edema (in its different forms listed in your text) appear on medical imaging examinations? Discuss any specific c

Define the structure of d and l isomerism, Define the Structure of D and L ...

Define the Structure of D and L isomerism? The prefix D or L are used to refer to the configuration of the carbon next to the primary alcoholic group or in other words, the con

Reagent for estimation of calcium by edta titrimetric method, Define Reagen...

Define Reagents for Estimation of Calcium Using EDTA Titrimetric Method? 1. Buffer solution: Dissolve 16.9 g NH 4 CI in 143 ml NH 4 OH. To this add 50 ml of solution containing

Explain water and electrolyte imbalance during kwashiorkor, Explain Water a...

Explain Water and electrolyte imbalance during kwashiorkor? The total body water and especially the extracellular fluid volume are increased in all forms of PEM. At the same ti

Difference between spermatocyte ii and spermatocyte i, Q. What is the diffe...

Q. What is the difference between spermatocyte II and spermatocyte I? The spermatocyte I (2n) undergoes the first division of meiosis (meiosis I) originating two spermatocyte I

Why is the cleavage in mammals as simple homoplastic, Why do the sons of a ...

Why do the sons of a haemophiliac father never vary from this trait? Why is the cleavage in mammals referred as simple homoplastic?

When does the greatest buffering capacity of weak acids, The greatest buffe...

The greatest buffering capacity of weak acids is when- Select one: a. They are almost completely dissociated b. They are almost completely undissociated c. They are nea

Light microscopy, LIGHT MICROSCOPY (LM) A study of the structure of organ...

LIGHT MICROSCOPY (LM) A study of the structure of organisms is an essential requirement of biology. However, unaided human eye cannot see objects smaller than 0.1 mrn(100 p) in d

Tolerance range, Maximum and minimum range of an animal with the factors of...

Maximum and minimum range of an animal with the factors of Ph Salinity Pressure Relative human

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages