Fundamental characters of embryonic development, Biology

FUNDAMENTAL CHARACTERS OF EMBRYONIC DEVELOPMENT

1.       GAMETOGENESIS-

Testes & ovaries are collectively called as gonads. Similarly sperms & ova are collectively called as gametes. The formation of gametes in the gonads is called as gametogenesis.

Gametogenesis is of 2 types -

(a) Spermatogenesis - formation of haploid sperms in the testes.

(b) Oogenesis - formation of haploid ova in the ovaries.

2.       FERTILIZATION

Fusion of haploid ova & sperms to form diploid zygote is called as fertilization. The sperm activates the ovum to develop.

3.       CLEAVAGE

It is a sequence of mitotic divisions which results in the formation of multicellular morula. The resulting cells are called as blastomere.

Cleavage is a type of mitotic division, resulting unicellular zygote convert into multicellular structure.

Formation of blastula through zygote, this process is called blastulation.

4.      GASTRULATION

The cells of blastula exhibits morphogenetic movements to form a triploblastic structure called gastrula. The process is called as gastrulation.

The blastocoel is lost gradually and a gastrocoel is formed.

The three germ layers formed in gastrula are ectoderm, mesoderm & endoderm.

A cavity present in the gastrula is called as Archenteron.

5.      ORGANOGENESIS

The germ layers form various organs, Firstly, they form small groups of cells which are called as primary organ rudiments.

The primary organ rudinents form secondary organ rudimetns which finally form tissues & organs in adults.

6.      GROWTH

The tissue & organs after formation exhibit grwoth & increase in volume.

The growth is due to constant mitosis and sythesis of nuclear & cytoplasmic materials. Gradually, the embryo grows & take the parental shape.

7.      DIFFERENTIATION

The growth of embryo is accompanied with differentiation which is of three types -

(a) Histological differentiation

(b) Chemical differentiation

(c) Physiological differentiation

8.      METAMORPHOSIS

Posted Date: 10/3/2012 7:08:41 AM | Location : United States







Related Discussions:- Fundamental characters of embryonic development, Assignment Help, Ask Question on Fundamental characters of embryonic development, Get Answer, Expert's Help, Fundamental characters of embryonic development Discussions

Write discussion on Fundamental characters of embryonic development
Your posts are moderated
Related Questions
Which are the plant tissues that form the plant roots? The roots have a central portion known as medulla made of vascular tissue (inner xylem and outer phloem). The medulla is

Treatment options for ailing and failing implants are varied. The clinician should start conservatively and progress to more aggressive therapy. The overall goal of therapy is

Q. What is an example of intraspecific competition? The Intraspecific competition occurs in practically all species, for instance, the competition of humans for a job.

Describe Implant exposure ? Sound surgical principles to minimize the surgical exposure based on the access required should be employed. A series of surgical approaches to achie

Define Measuring cylinder - Nutritional Biochemistry? It is used for measuring those reagents which need not be added in very accurate volumes. Strong acids and alkalis are add

Staphylococcosis The disease is caused by the ingestion of preformed toxin released by Staphylococcus aureus. Epidemiology: Staphylococci grow in meat, dairy and bakery prod

Explain biological aspects of nutrition Traditionally nutritionists have focused largely (or almost fully) on . However, we have realized over the years, that physiological bio

what is osismosi

what are the chemical changes takes place during cleavage

CT is a 3 year old female who develops signs of hypoglycemia in the early morning unless she is fed during the night.  CT eats balanced meals for her age group during the day, with