Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Products of Cleavage (Morula and blastula)
In several cases, the blastomeres in early cleaving stages tend to presume spherical shape like that of the egg earlier than cleavage. Even though their mutual pressure (resulting from limited available space in the egg envelopes) flattens the surface of blastomeres in contact with each other, the free surfaces of each blastomere stay spherical. The result of it is that after some cleavage divisions have taken place the embryo has a shape that resembles mulberry. Due to this superficial resemblance this stage of embryonic development of many animals has been considered to as Morula (Latin for mulberry).
As cleavage divisions carry on the subsequent arrangement of the blastomeres in the morula may change in different groups of animals. In some the blastomeres are packed together with no any space among them, or a small cavity appears but is soon obliterated. In both cases the result is the creation of a solid blastula called stereoblastula example some flatworms, annelids, molluscs and coelenterates. In such type of blastulae some of the blastomeres lie externally and others in the interior. But, in several animals the cavity appearing among the blastomeres persists and may enlarge. This cavity is termed as blastocoel. As the cleavage progresses, the adhesion of the blastomeres to one other increases and they arrange themselves as an epithelial layer around the blastocoel. This stage of embryonic development is termed as blastula and such blastula is called coeloblastula (hollow blastula). The layer of blastomeres is considered to as blastoderm.
How different are reptiles and birds concerning the maintenance of body temperature? Are birds rare in polar regions? Reptiles are heterothermic, i.e., they do not control thei
An mRNA molecule codifies only one type of protein? Eukaryotic cells have monocistronic mRNA, i.e., every mRNA codifies only one polypeptide chain. Prokaryotes can present poly
Which type of defense cell do bacteria attract and cause to multiply during the inflammation process? What is the name given to the waste material produced by the inflammation trig
What happens to respiratory system in a man going up a hill?
P r o s p ec ts of meat products The demand for convenience meat based fast food is ever increasing due to rapid industrialization and urbanization, higher standards of l
Extruded Starch Cereal products, that are prepared by pumping cereals through a small opening for instance, pasta, Ready-to-eat cereals etc.
Human Impact on the Phosphorus Cycle Like other biogeochemical cycles, human activities have altered the phosphorus cycle. Human beings mine phosphate rocks and guano deposits
True or false? It would be difficult to assess whether the drug-susceptible or drug-resistant phenotype in a population of Mycobacterium tuberculosis was more fit in an environment
Q. Etiological factor of diverticular disease? The causes of diverticular disease are not certain, but several factors may contribute to changes in the wall of the colon. These
Discuss the role of NADPH in erythrocytes The fragility of erythrocytes is impaired in the absence of NADPH generation due to the deficiency of glucose-6-phosphate dehydrogena
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd