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

Determine the maximum crop yield In determining maximum crop yield it was thought that a given plant let us say corn, is only inherently capable of producing a given amount of

In a twin study of 1000 MZ pairs, 625 pairs were found to have both twins with the same form of a given trait. In a study of 1000 DZ twins, 426 pairs were found to have both twins

what are the advanced characters of phylum annelida that cannot be found in other phyla?

Formation of pronuclei : Information of pronuclei, micronucles which is one of the conjugants, plays anĀ important role. Micronucleus undergoes meiosis and forms four haplo

Epidemiology The organism does not appear to be very host or tissue specific and can infect naturally a large number of avian and mammalian species. Chlamydiosis has been reco

Why should an athletes take Proteins? Proteins are basically taken for their ergogenic properties of enhancing endurance and increasing or maintaining muscle mass to improve st

Clinical symptoms of HIV Generally, a person infected with HIV does not show any apparent symptoms for a number (3 to 12) of years. Ten to fifteen percent infected people may,

What is the phototropism? The Phototropism is the movement of plant structures in response to light. The Phototropism may be negative or positive. The Positive phototropism is

What is the significance of Malpighian tubules? Excretory structures found in insects and some spiders. Though similar in appearance and function the two aren't homologous. Mal