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

Reproductive organs, Reproductive Organs In several metazoans, gonads ...

Reproductive Organs In several metazoans, gonads are well-defined. Testes and ovaries take up dissimilar shapes and anatomical dispositions. In cases of certain hermaphrodites

What are the functions of the spleen, Q. What are the functions of the sple...

Q. What are the functions of the spleen? Why is a total splenectomy (surgical removal of the spleen) compatible with life? The spleen has many functions: it participates in the

Phylum labyrinthomorpha - protozoan, Phylum Labyrinthomorpha - Protozoan ...

Phylum Labyrinthomorpha - Protozoan Trophic stage, ectoplasmic network with spindle shaped or spherical nonamoeboid cells. Small group living on algae; mostly marine or estuar

Texture of food product, Q. Texture of food product? Texture may be acc...

Q. Texture of food product? Texture may be accessed through touch or mouth feels. When the food is placed in the mouth, the surface of the tongue and other sensitive skin react

Gregor johann mendel, GREGOR JOHANN MENDEL 1.         Mendel was born o...

GREGOR JOHANN MENDEL 1.         Mendel was born on 22 July 1822 at Heizendorf in Austria at Selesia village. 2.         Mendel was worked in Augustion Monastry as monk at Br

Work sheet, When the Balance Sheet column totals don't agree on the first a...

When the Balance Sheet column totals don't agree on the first attempt work backward through the process used in preparing the work sheet exclusively take the following steps until

Agro industrial-glycosides, Glycosides Calcinogenic glycosides: C...

Glycosides Calcinogenic glycosides: Certain plants contain glycosides of the active metabolite of vitamin D. The metabolite is called 1, 25-dihydroxycholecalciferol or mo

DNA copying, why DNA copying is essential

why DNA copying is essential

Tisues, digram or mammalian testis

digram or mammalian testis

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