Meroblastic or partial cleavage, Biology

Meroblastic or partial cleavage

The egg does not divide totally because divisions are restricted to only a part of the egg where as the rest of the egg remains completely uncleaved. It is of two types:

A. Discoidal meroblastic cleavage: It occurs in the heavily yoked macrolecithal and highly telolecithal eggs, as for instance in cephalopod molluscs, reptiles, birds and monotremes (egg laying mammals). The cleavage is restricted to the cytoplasmic germinal disc located at the animal pole. Even the germinal disc divides incompletely where as the entire yolk mass remains undivided.

B. Superficial meroblastic cleavage: This takes place in the centrolecithal eggs of insects. Cell divisions are restricted to the peripheral cytoplasmic layer whereas the centrally located yolky is left undivided.

Posted Date: 1/25/2013 1:28:27 AM | Location : United States







Related Discussions:- Meroblastic or partial cleavage, Assignment Help, Ask Question on Meroblastic or partial cleavage, Get Answer, Expert's Help, Meroblastic or partial cleavage Discussions

Write discussion on Meroblastic or partial cleavage
Your posts are moderated
Related Questions
Design a controlled experiment to test the hypothesis that acid precipitate inhibits the growth of elodea, a common freshwater plant.

Define Factors that Affecting the Calcium Absorption? It is a well known fact that the amount of calcium that we eat need not be the amount of calcium that gets absorbed. The d

Forebrain 1 .       OLFACTORY LOBES - 1 pair, very small, solid, club shaped, separated from each other. Fully covered by cerebral hemispheres on dorsal side, clear on

in natural vegetative propagation which structure gives rise to new individuals?

Feed adulterants Adulteration of raw material is creating a serious problem for manufacturing the good quality feed as the trading of raw ingredients is totally in unorganized

List the four phases of mitosis, and briefly explain what occurs during each phase. Prophase: the chromatin coils and produces chromosomes, the nucleolus and nuclear envelope d

Q. What are the uses of National parks ? National Park is an area dedicated to conserve environment, natural and historical objects and to conserve the wild life therein. Natio

MASTITIS The term mastitis refers to the inflammation of udder and is characterized by physical and chemical changes in the milk which include discolouration, presence of clots

HEARIN G  - Sound waves struck ear drum, it starts vibrations, these vibrations are carried to MIS → f. ovalis → S. vestibule →  Hellicotrema → S. Tympani → f. rotundus → mi

Stethoscope Stethoscope is used for listening to the internal sounds of a body. Stethoscopes vary in their design and material. Most are made of Y-shaped rubber tubing. This sh