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. What are examples of the economic and ecological importance of molluscs? Molluscs are important players in several food chains in ecosystems. Many marine molluscs are part o

Q. How are the epithelial tissues classified? The epithelial tissues are classified according to the shape of the cells that form it epithelial cells may be columnar, cuboidal,

How can we increase of total peripheral resistance?   A.  A decrease in the diameter of every arteriole.   B.  An increase of sympathetic discharge to all the smooth muscles

BRONCHUS - In thorax trachea is devided in to 2 bronchi that enter into lungs of its own side. Rings present in it. BRONCHIOLES - These are branches of bronchus.

Q. Describe Postpartum Cardiomyopathy? It is defined as presentation of LV Systolic dysfunction and heart failure in last trimester of pregnancy or within 6 months of delivery.

CYTOCHEMISTR Y OF PROTOPLASM - It is supper mixture or mixture of mixtures . 3 4 elements present in it. 1 3 elements are universal. e.g. C, H, O, N, P, K, S,

Factors Associated With Accident Cost in Administrative Functions Loss of prestige. Costs for notification, investigation and legal action. Loss of pu

Dr. Herbert discovers a cell and he is convinced it is a plant cell. However, as a student of his genetics class, you do not agree with him. You do not believe in microscopy and ph

Problem 1: How does the FDA's post marketing surveillance system works? Show FDA's post marketing surveillance system Explain about Adverse Event reporting system and

Which of the following serves as an effector, or part of an effector, that functions in a negative feedback system? A. 1,25-dihydroxyvitamin D Receptors located intracellularly