Plane of cleavage, Biology


  • Each cleavage of the division zygote is marked by a cleavage furrow.
  • Usually the first cleavage furrow is vertical & passes through the main axis of the egg.
  • The second cleavage furrow is also vertical but at right angle to the first one.
  • The third cleavage furrow is horizontal or parallel to the equator.
  • These planes are of 4 types -

1. Meridional plane - Cleavage forrow passing through the middle, animal vegital poles axis. eg. Amphioxis, frog and first cleavage of chick.

2. Vertical or longitudinal plane - The vertical cleavage pass through the animal & vegital pole but not through the median axis. The cleavage furrow pass either to the right or left of the axis. eg. III cleavage of chick.

3. Equitorial plane - The cleavage furrow is horizontal / transverse and it pass between the animal & vegital pole. eg. I cleavage of the higher mammals including man.

4. Lattitudinal plane - The previous furrow is transversely or horizontally not on the equator. eg. III cleavage in the egg of amphioxis and frog.

Posted Date: 10/3/2012 8:54:12 AM | Location : United States

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

Write discussion on Plane of cleavage
Your posts are moderated
Related Questions
Light Requirement - Seed Dormancy The light requirement for germination of many seeds is presumably a mechanism that prevents the germination of small seeds buried deep underg

PO L YTEN E CHROMOSOMES First seen by Balbiani in salivary glands of larva of Chironomus insect (belongs to order Diptera). Later on such chromosomes observed in severa

how trematodes/nematodes adapt to their parasitic mode of feeding

Respiration It is important that you comprehend the main points because they ate essential for your understanding of respiratory physiology. To enter or leave the body, oxygen

Sir/Madam, I am a Banquet Farm Owner and face the problem with the Grass that in November & December the grass does not grow well or disappear beacuse of heavy foot fall. Is their

Foods to be avoided are: High fibre foods like whole grain cereals and  their products (e.g. whole wheat flour, cracked wheat, whole pulses) Raw vegetables and fruits Fri

Suppose that a portion of double-stranded DNA in the middle of a large gene is being transcribed by an RNA polymerase. As the polymerase moves through the sequence of six bases sho

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Explain about the Niacin - Water Soluble Vitamin? Niacin is chemically synonymous with nicotinic acid although the term is also used for its amide (nicotinamide). Nicotinamide

Identify the hormones produced by the anterior and posterior lobes of the pituitary gland and specify the functions of those hormones.