Basic planes of cleavage, Biology

Basic Planes of Cleavage

The basic planes along which the egg and its daughter blastomeres are divided during early cleavage are:

A. Meridional Plane - the cleavage furrow passes from the animal pole to the vegetal pole through the centre of the spherical egg or the blastomeres so as to divide the egg into two equal halves, e.g., first cleavage furrow in the chick and first as well as second cleavage furrows in the frog's egg.

B. Vertical Plane - the cleavage furrow forms parallel to animal-vegetal axis but a little away from the centre of the blastomeres, e.g., thud cleavage plane of chick blastoderm.

C. Equatorial Plane - the cleavage furrow bisects the egg at right angle to the median axis exactly half way between the animal and vegetal poles the cleavage furrow appears along the equator of the spherical egg, e.g. the third cleavage plane of sea urchin.

D. Latitudinal or transverse or horizontal plane - it is like equatorial but the cleavage furrow passes through the egg cytoplasm on either side of equator along the latitudes of the egg sphere, e.g., third cleavage plane of amphibian eggs.

Posted Date: 1/25/2013 1:00:10 AM | Location : United States

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

Write discussion on Basic planes of cleavage
Your posts are moderated
Related Questions
Q. How many cellular nuclei does the pollen tube of angiosperms have? What is ploidy of each of these nuclei? The pollen tube explicitly the mature male gametophyte of angiospe

In humans, attached earlobes are a dominant feature over free earlobes while hypertrichosis of the ear is a holandric (Y-linked) feature. A person with attached earlobes and extens

Asymptomatic patient: The current opinion is that in asymptomatic patients with left ventricular dysfunction and severe MR surgery should not be delayed. The echo cardiographic a

ME T AMORPHOSIS The differentiation results in the formation of larva / infant. The formation of adult from the larva / infant is called as metamorphosis. The metamorph

Open Type of Circulatory Systems Several non-chordates have thus an open type of circulation - a system in which blood pumped by the heart empties through an artery into an op

Chlorophyll Chlorophyll is the porphyrin most widely used as a natural colourant. Its widespread occurrence in photosynthetic  tissue and its breakdown character have prompted

diagram of dna replication

Membrane Oxygenators: They are more physiological and are similar to natural lungs. There is separation of blood and gas by membrane across which gas exchange takes place. There