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

Classification of enzymes, Classification of Enzymes : Enzymes are clas...

Classification of Enzymes : Enzymes are classified  into the following six main categories in according with  the nature of reaction the catalyze: 1.      Oxidoreductases

Explain the spectrophotometer or colorimeter, Explain the Spectrophotometer...

Explain the Spectrophotometer or Colorimete? These can be used to measure the microbial growth or can be used in various microbial and biochemical assays. Figure illustrates t

.general methods for studying microbial physiology, what are the general me...

what are the general methods for studying microbial physiology

Function of noradrenaline in consciousness, Q. Function of Noradrenaline in...

Q. Function of Noradrenaline in consciousness? Increased level of noradrenalin is implicated in wakefulness. Locus coeruleus noradrenergic neurons decrease their rate of firing

Define gender discrimination - public nutrition, Define Gender Discriminati...

Define Gender Discrimination - Public Nutrition? Of the detrimental factors, that affect food security, gender discrimination is the most pervasive and vicious. The fact that h

What is the general function of leukocytes, Q. What is the general function...

Q. What is the general function of leukocytes? What are leukopenia and leukocytosis? The general function of leukocytes is to participate in the made inside the body or defense

Define the surgery process for cancer patient, Define the Surgery Process f...

Define the Surgery Process for Cancer Patient? Surgery is generally conducted in the absence of metastasis i.e. when a tumor is localized. Nutrition support would vary dependin

What are the destinations of those oxygen atoms, Q. Photosynthesis is the m...

Q. Photosynthesis is the most significant producer of molecular oxygen (O2) on our planet. From which molecule do oxygen atoms liberated by photosynthesis come and from which other

Explain the toxicity of vitamin d, Explain the Toxicity of Vitamin D? ...

Explain the Toxicity of Vitamin D? The adverse effects of high vitamin D intakes include hypercalciuria (excessive urinary calcium excretion) and hypercalcaemia (high concentr

Phylum Arthropoda, What is an example of animal coming from the phylum art...

What is an example of animal coming from the phylum arthropoda?

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