Meroblastic or partial cleavage, Biology

Assignment Help:

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.


Related Discussions:- Meroblastic or partial cleavage

Johne''s disease, J o h n e ' s disease It is also known as parat...

J o h n e ' s disease It is also known as paratuberculosis characterized by chronic enteritis and progressive weakness in dairy animals. E t iology: Mycobac

Is water a polar molecule or non-polar, Q. Is water a non-polar or a polar ...

Q. Is water a non-polar or a polar molecule? What is the consequence of that characteristic for the function of water as solvent? Water is made of two atoms of hydrogen attache

The right side of the container, A solute passes from higher concentration ...

A solute passes from higher concentration on the left of a container to the right side of container thru a membrane. What would happen if a second solute of lower concentration was

Procedure for estimation of vitamin c - colorimetric method, Define Procedu...

Define Procedure for estimation of vitamin c - colorimetric method? Carry out the experiment following the instructions given herewith: 1. Prepare a series of tubes for blan

Predict whether narrowing or widening of the blood vessels, Body temperatur...

Body temperature is homeostatic ally regulated around a set point. Given your knowledge of negative feedback and homeostatic control system, predict whether narrowing or widening o

Haploid production, Haploid Production The higher plants are normally ...

Haploid Production The higher plants are normally diploid, with two sets of chromosomes in their somatic cells. Their haploids (with one set of chromosomes) arise in nature by

Air pollution - environmental pollution, Air Pollution - Environmental Poll...

Air Pollution - Environmental Pollution The threat due to air pollution became apparent only when some severe episodes caused human casualty in USA, Britain (London) and Japan

Complications during rheumatic heart disease, Q. Complications during rheum...

Q. Complications during rheumatic heart disease? Inflammation of Inning of heart (pericarditis), anaemia, heart ,enlargement, valve deformities (mitral and tricuspid valves),

How to improve the quality of protein in the diet, How to improve the Quali...

How to improve the Quality of Protein in the Diet? Since the net protein utilization (NPU) values of milk or egg proteins are higher than those of proteins of average diets con

Explain cytoskeleton, What is cytoskeleton? What are its main constituents ...

What is cytoskeleton? What are its main constituents in animal cells? Ans) Cytoskeleton is the cytoplasmic structure that handles the cell, keeps its shape and fixates and moves

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd