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

What are pioneer species, What are pioneer species? What is the role of the...

What are pioneer species? What is the role of the pioneer species? Pioneer species are those first species that colonize places where before there were no living beings, like,

Define criteria for assessment of pyridoxine status, Define Criteria for As...

Define Criteria for Assessment of Pyridoxine Status? Vitamin B 6 status is most appropriately evaluated by using a combination of indicators,  namely plasma PLP concentration,

Define function of thiamin as regulator of enzyme activity, Define Function...

Define Function of thiamin as Regulator of enzyme activity? Thiamin regulates the enzymes involved in carbohydrate metabolism. These are: a) Pyruvate dehydrogenase, which pr

Harshey-chase experiement, What is the Harshey-chase experiement .explain i...

What is the Harshey-chase experiement .explain in detail

Predict whether narrowing or widening of the blood vessels, Body temperatur...

Body temperature is homeostatic ally regulated around a set point. Given your knowledge of negative feedback and homeostatic control system, predict whether narrowing or widening o

Protein folding, Protein Folding With all the known information of prot...

Protein Folding With all the known information of protein structure from X-ray and NMR studies and one might expect in which we would know how proteins fold up within structure

Inferior alveolar nerve, Inferior alveolar nerve Inferior alveolar ner...

Inferior alveolar nerve Inferior alveolar nerve repositioning to facilitate the placement of endosseous implants posterior to mental foramen is associated with very high incid

Define the absorption of vitamin a, Define the Absorption of Vitamin A? ...

Define the Absorption of Vitamin A? Vitamin A and carotenoid tend to aggregate with lipids into globules, which then pass into the small intestine. Dietary vitamin A (retinol)

Air movements at tropical latitudes, Air movements at tropical latitudes ...

Air movements at tropical latitudes Let us now explain air movements at tropical latitudes. The surface air that rushes to fill the equatorial void from the north is deflected

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