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

.general methods for studying microbial physiology, what are the general me...

what are the general methods for studying microbial physiology

Osmosis, If you have water, 10% sucrose, and 40% sucrose solution. Which so...

If you have water, 10% sucrose, and 40% sucrose solution. Which solutions were isotonic to each other?

What do you mean by osteichthyes and condrichthyes, Q. From which features ...

Q. From which features do osteichthyes and condrichthyes get these names? "Chondros" means cartilage, "ictis" means fish (both from the Greek) the name chondrichtians is for fi

Under which forms is the trypanosoma cruzi found, Q. Under which forms is t...

Q. Under which forms is the Trypanosoma cruzi found in its hosts? In the definitive hosts also as in triatomine bugs (intermediate hosts) the protozoan that causes Chagas' dise

Contamination due to pathogens - water pollution, Contamination due to Path...

Contamination due to Pathogens - Water Pollution Sewage is a source of pathogenic viruses, bacteria, worms and other parasites. The extent of contamination by these pathogens

Genetics, Ask question importance of genetics in human life #Minimum 100 w...

Ask question importance of genetics in human life #Minimum 100 words accepted#

Concepts and definitions in relation to nutrient requirement, Concepts and ...

Concepts and Definitions in Relation to Nutrient Requirements 1) The probability concept describes the relationship between the levels of intake and the probability of risk of

Explain the cell cycle in details, Explain the cell cycle in details? M...

Explain the cell cycle in details? Most cells of higher organisms follow a cyclic pattern of division. The bulk of the cycle consists of the stage known as interphase, the peri

Skeletal system - hyoid bone, HYOI D BONE - Also called tongue bone...

HYOI D BONE - Also called tongue bone as lies at the base of the tonuge. One in number. Muscles of tongue and throat are attached to it. Not e :- Except

What are the two main subdivisions of the phylum Chordata, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 What are the two mai

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