Planes of cleavage, Biology

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.

Posted Date: 1/25/2013 12:59:05 AM | Location : United States







Related Discussions:- Planes of cleavage, Assignment Help, Ask Question on Planes of cleavage, Get Answer, Expert's Help, Planes of cleavage Discussions

Write discussion on Planes of cleavage
Your posts are moderated
Related Questions

What are the Pupillary defects There are certain deviations  from normal pupillary reflexes which point towards certain specific pathology.

How many biochemicals would be detected in the stomach contents of an omnivorous dinosaur?

Role of Nerves - Regeneration It has been seen that soon after amputation nerves invade the regeneration blastema. If the stump is denervated by cutting the nerves supplying

Impoundments - Lentic Ecosystems We have so far discussed natural lakes. In addition to these there are a number of lakes both small and large artificially created by man cal

Domestication - Wildlife It means that man has taken under his direct care the living beings which are useful to him. Through extensive breeding programmes, he has modified th

1. Describe what effects epigenetic modifications such as methylation and acetylation can have in eukaryotic cells, and how these modifications are added or removed from chromatin.

Define Requirements of Fat in Postoperative Nutritional Care Adequate amount of fat is needed to build up and maintain tissue fat reserves. Depending upon the existing health a

Centrifugal Pump: This is available for clinical perfusion from 1976 (Bio Medicus Pump). It is disposable, causes less blood trauma and reduces the risk of massive air embolism.

Essential Concepts of Endosseous healing 1) Osteoblast is the prime bone matrix synthesizing cell. Like most secretory cells, osteoblasts are polarized cells, and the direction