Zygote - embryogenesis, Biology

Assignment Help:

Zygote - Embryogenesis

The fertilized egg or zygote is situated at the micropylar end/pole of the embryo sac, its basal (micropylar) end is attached to the embryo sac wall and apical (chalazal) part projects into the central cell. The zygote usually undergoes a period of rest during which it shrinks. This resting period of the zygote varies with different species and is to some extent dependent on environmental conditions e.g. in Theobroma cacao the zygote divides 14 to 15 days after fertilization, in Oryza saliva zygote divides about 6 hours after fertilization.

A complete cell wall is formed around the zygote. (You would dl that the egg has only plasmalemma and no wall at its apical part). A TEM picture shows that zygote cytoplasm show a more polarized appearance and that is the two poles appear different, micropylar part is vacuolate and chalazal part with a prominent nucleus.


Related Discussions:- Zygote - embryogenesis

Explain about the anorexia nervosa, Explain about the Anorexia Nervosa? ...

Explain about the Anorexia Nervosa? Anorexia nervosa, as you have read above, is a psychological eating disorder characterized by somatic delusions that one is too fat despite

Principles of doppler echocardiography, Doppler echocardiogaphy is based on...

Doppler echocardiogaphy is based on  the Doppler effect, which was  described by  the Austrian phy$icist Christian Doppler in  1842. The Doppler effect states that sound frequency

Pour plate method, what is advantages and disadvantages of the pour plate m...

what is advantages and disadvantages of the pour plate method

What is the difference between disaccharides, Q. What is the difference bet...

Q. What is the difference between disaccharides and monosaccharides? What are some examples of monosaccharides and of disaccharides that form them? Monosaccharides are simple m

Explain in brief about the trail making test, Explain in brief about the Tr...

Explain in brief about the Trail Making Test In part A of this procedure the subject must connect in order a series of circled numbers randomly scattered over a sheet of 81\2 X

Eyes, Are dogs colour blind

Are dogs colour blind

Main components of blood plasma, Main Components of Blood Plasma You w...

Main Components of Blood Plasma You would recall the various types of cells found in blood. The composition of human blood plasma is given in Table. The very structure of bloo

Explain the development of sirs or mods, Explain the Development of SIRS or...

Explain the Development of SIRS or MODS? Multiple hypothesis have been proposed to explain the development of SIRS or MODS. The progression of SIRS to MODS appears to be mediat

Importance of the fruits for the angiosperms, What is the evolutionary impo...

What is the evolutionary importance of the fruits for the angiosperms? The fruits have seeds and they can detach from the plant falling on the ground or can serve as food for a

External factor - factor controlling metamorphosis in insect, External fact...

External factors - Factors Controlling Metamorphosis in Insects In few cases an external factor may be accountable for initiating moulting, as for instance in the blood su

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