Planes of cleavage, Biology

Assignment Help:

Planes of Cleavage

The ova of most of the animal groups (except some specific cases like insects) are spherical or nearly spherical having their own actual centre comparable to earth shape. Similar to north and south poles on earth, the egg has animal and vegetal poles. The yolk platelets have more density than active cytoplasm and are concentrated more towards vegetal hemisphere. Therefore, when the egg lies in any fluid medium (the fundamental feature of most of the eggs even in the apparently terrestrial eggs like those of birds etc.), the vegetal pole tends to face the centre of gravity and animal pole away from it.


Related Discussions:- Planes of cleavage

Genetics of nitrogen-fixation, Genetics of Nitrogen-fixation The genet...

Genetics of Nitrogen-fixation The genetics of nitrogen-fixation is known in detail in Klebsiella pneumoniae. There are twenty genes required in organising the complete N 2 -fi

Corpus cardiacum - endocrine organs, Corpus Cardiacum - Endocrine Organs ...

Corpus Cardiacum - Endocrine Organs We before mentioned that corpus cardiacum (pl. corpora cardiaca) is a neurohemal organ in insects. It is gland of neural origin. They are c

Nutritional management for patient of alzheimer''s disease, Define Feeding ...

Define Feeding and Nutritional Management for patient of alzheimer's disease? Keeping the clinical manifestations of Alzheimer's disease in mind, treatment involves personaliz

What are the male pronucleus and the female pronucleus, Q. What are the mal...

Q. What are the male pronucleus and the female pronucleus? The female pronucleus is the proper haploid nucleus of the egg cell and Male pronucleus is the haploid nucleus of the

Wild type embryo, In Drosophila, the anterior determinant Bicoid is known t...

In Drosophila, the anterior determinant Bicoid is known to activate expression of the gene hunchback in the anterior half of the embryo.  (Bicoid is a transcription factor, which b

Explain adverse effects of cidofovir, Explain Adverse Effects of Cidofovir ...

Explain Adverse Effects of Cidofovir About 25% of patients discontinue cidofovir because of adverse effects such as nephrotoxicity, neutropenia and metabolic acidosis. Iritis,

The right side of the container, A solute passes from higher concentration ...

A solute passes from higher concentration on the left of a container to the right side of container thru a membrane. What would happen if a second solute of lower concentration was

Cellular strategies to improve bone formation at implants, Molecular and ce...

Molecular and cellular strategies to improve bone formation at implants The healing response of biological tissues to the oxide surface is sensitive to the way in which the sur

Define salient modifiable factors which affect birth weight, Define salient...

Define salient modifiable factors which affect birth weight? The following are the salient modifiable factors which affect birth weight and gestation adversely: Iron deficiency

Respiration, how do respiration take place in animal????

how do respiration take place in animal????

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