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

Absorption of proteins in infants, Absorption of proteins in infants In...

Absorption of proteins in infants In  infants, permeability of  the  intestine appears to be greater than  in  later  life, and some  large  protein molecules such as antibodie

Male reproductive disorders-congenital impotentia genarandi, Congenital imp...

Congenital impotentia genarandi Some bulls which are otherwise normal and healthy produce semen containing spermatozoa with specific morphological abnormalities together with

Lactation tetany of mares (eclampsia, Lactation tetany of mares (eclampsia,...

Lactation tetany of mares (eclampsia, transit tetany) Hypocalcaemia in mares causes lactation tetany, which is characterized by abnormal behaviour, in coordination and tetany.

Lymph, LYMPH - Lymph is a mobile connective tissue comprising lymph pla...

LYMPH - Lymph is a mobile connective tissue comprising lymph plasma (fluid) and lymphcorpuscles (cells).   COMPOSITIO N - (i )      Lymph Plasma - It is simil

Explaintransketolase, ExplainTransketolase Transketolase with the help...

ExplainTransketolase Transketolase with the help of TPP  and Mg ++   is  required again. This  time  it  transfers carbon 1+2 from xylulose-5-phosphate  to erythrose-4-phospha

Importance of reproduction, Importance of reproduction Reproduction ...

Importance of reproduction Reproduction is an important life process in animals and plants. Reproduction is the ability of an organism to produce new generation of indivi

Coxal glands, Coxal Glands There is a pair of coxal glands, in almost ...

Coxal Glands There is a pair of coxal glands, in almost all the segments in Onychophora (Peripatus). Developmentally; in every segment a hollow follicle or somite arises and i

Classification of aquatic organisms, Classification of Aquatic Organisms ...

Classification of Aquatic Organisms After discussing the common types of the aquatic ecosystem let us now study in brief the ecological classification of aquatic organisms. I

How execute the two complementary nucleotide chains, Q. How execute the two...

Q. How execute the two complementary nucleotide chains of the DNA facilitate the replication process of the molecule? The fact that DNA molecule is made of two polynucleotide c

Relationship between the ovulation and menstrual cycle, Q. What is the rela...

Q. What is the relationship between the ovulation and menstrual cycle? Ovulation is the releasing of the female gamete from the ovary and Ovulation is a periodical event that o

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