Cleavage and gastrulation, Biology

Assignment Help:

Cleavage and Gastrulation

Eventually, one spermatozoon fuses with the ovum to r restore the diploid genomic condition and activates all the potentials in the fertilized egg cell or zygote to develop into a new individual of the next generation. But the zygote is one cell and the adult body in the Metazoa is constituted of many cells - from a few hundred to many billions of cells. It implies that the unicellular zygote must enter the phase of rapid divisions in quick succession to convert itself into a multicellular body.

Such a series of divisions of the zygote is known as cleavage or segmentation. In this multicellular structure formed as a result of cleavage the various cells or cell groups later become rearranged as layers and sub layers during a process called gastrulation. Cleavage and gastrulation are significant phases in the ontogenetic development because cleavage transforms the unicellular zygote into a multicellular body and gastrulation lays the foundation of primary organ rudiments so as to initiate the formation of organs according to the body plan of the particular metazoan group of animals to which the particular individual belongs.


Related Discussions:- Cleavage and gastrulation

Natural selection is such a powerful force, Natural selection is such a pow...

Natural selection is such a powerful force in evolution because cells with even a small growth advantage quickly outgrow their competitors. To illustrate this process, consider a b

How is excretion done in amphibians, Q. How is excretion done in amphibians...

Q. How is excretion done in amphibians? Adult amphibians have kidneys that filter blood. Nitrogen waste is excreted as urea so amphibians are ureotelic beings. The aquatic, lar

Explain entecavir, Explain Entecavir  Entecavir  (Baraclude) taken ora...

Explain Entecavir  Entecavir  (Baraclude) taken orally once a day as monotherapy appears to be superior to lamivudine for patients with chronic HBV infection, but susceptibili

Explain prophylaxis with antimicrobial, Explain Prophylaxis with antimicrob...

Explain Prophylaxis with antimicrobial Prophylaxis with antimicrobials has decreased the incidence of surgical site infection after head and neck operations that involve an inc

Explain procedure for isolation of pure culture, Explain Procedure for Isol...

Explain Procedure for Isolation of Pure Culture? Now carry out the exercise following the steps enumerated herewith. 1. Label the name of the organism on the bottom of the p

Polynephritis in cattle, Polynephritis in cattle Contagious bovine pol...

Polynephritis in cattle Contagious bovine polynephritis is a specific infection of urinary tract of cattle. The causative agent is Corynebacterium renale, a rod shaped gram-po

Xylem transfer cells, Xylem transfer cells The lateral transport of io...

Xylem transfer cells The lateral transport of ions from root xylem to leaves probably takes place via xylem transfer cells which have two special features: The ce

Show foods that damage gi mucosa, Q. Show Foods that damage GI mucosa? ...

Q. Show Foods that damage GI mucosa? Foods that damage GI mucosa: A number of spices, herbs and other condiments have been found to have little or no irritating effect on the m

Difference between mussels and octopuses, Q. What is the difference between...

Q. What is the difference between mussels and octopuses regarding their circulatory systems? How does that difference influence the mobility of these animals? Cephalopod mollus

Define role of nutrients in controlling gene expression, Define Role of Nut...

Define Role of Nutrients in Controlling Gene Expression? The role of several nutrients in controlling gene expression, as mentioned earlier, is in infancy, but with advancing b

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