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

Foods for phenylketonuria patient, Q. Foods for phenylketonuria patient? ...

Q. Foods for phenylketonuria patient? The majority of foods for a PKU patient should come from the bottom half of the pyramid. As you may have observed, this contains the pheny

Rassenkreis and speciation, According to the current concept of speciation,...

According to the current concept of speciation, a widely distributed species should break up into partially isolated rule species. The different subspecies become differentiated fu

Viscosity - blood flow, Normal 0 false false false EN-I...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Show the structure of the adult fern, Q. What is the structure of the adult...

Q. What is the structure of the adult fern within which cells undergoing meiosis can be found? In these plants meiosis takes place within structures known as sorus (plural, sor

Carpentier-technique of operation, Carpentier: Edwards or similar annul...

Carpentier: Edwards or similar annuloplasty ring is then sutured into place by interrupted sutures to support the repair and reduce the annulus to a measured amount. The ring m

Excretion, living organisms and their excretory products

living organisms and their excretory products

What is the usual shape of poriferans, Q. What is the usual shape of porife...

Q. What is the usual shape of poriferans? Sponges have bodies in the form of globes or tubular vases open in the upper extremity. They have a porous walls and internal central

What is trna structure , Transfer  RNA  (tRNA)  molecules  play  an  very s...

Transfer  RNA  (tRNA)  molecules  play  an  very significant  role  in  protein  synthesis. Each tRNA becomes covalently bonded to a particular amino acid  to  create  aminoacyl- t

Alpha helix and the beta-sheet protein, What is the difference between the ...

What is the difference between the alpha helix and the beta-sheet protein conformations? Ans) Alpha helix and beta-sheet conformations are the two major types of secondary struc

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