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

Definition of breach of contract, Question 1: Mention the types of IRBs...

Question 1: Mention the types of IRBs. If the IRB disapproves clinical study, can the sponsor approach another IRB? Justify your answer. Mention different types of IRBs

Herbage area or vegetation cover, Herbage area or vegetation cover Her...

Herbage area or vegetation cover Herbage area or vegetation cover is an important aspect of vegetation study in understanding the nature of a community particularly in evaluat

Explain semi-synthetic gums, Modified or Semi-synthetic Gums These are ...

Modified or Semi-synthetic Gums These are natural polymers, which are chemically modified to give a new product with improved functional properties. These also fall into severa

Determine pull-ups test for check the body strength, Determine Pull-ups tes...

Determine Pull-ups test for check the body strength? This test is also done to measure upper body strength or endurance by maximum number of pull-ups completed. Subject hangs f

Gastrulation, GAS T RUL A TIO N - Morphogenic movements are occure...

GAS T RUL A TIO N - Morphogenic movements are occured. 3 germinal layers are formed. Ectoderm, endoderm & mesoderm. Endoderm is formed first. Mesoderm is formed in the

Why capsulate staining is difficult, Why Capsulate Staining is Difficult? ...

Why Capsulate Staining is Difficult? Capsule staining is difficult because capsular material is soluble in water and may be dislodged or removed during vigorous washing. Negati

Animal biodiversity, why obwlia is considered to be of special interest in ...

why obwlia is considered to be of special interest in zoologyas an animal showing an intermediate grade of organisation

Protoplasmic - level of body organization, Protoplasmic - Level of body org...

Protoplasmic - Level of body organization Organisms which are made of just one cell are the simplest and the most primitive creatures called unicellular organisms. Their level

What is the etiological agent of visceral leishmaniasis, Q. What is the eti...

Q. What is the etiological agent of visceral leishmaniasis? How the disease transmitted and what is are its typical manifestations? The Visceral leishmaniasis is caused by the

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