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.
Is memory loss an early sign of Alzheimer's disease? A. Memory loss is one of the earliest symptoms of Alzheimer's disease and other kinds of dementia however occasional forget
what is somogyi
Omni Science Valve : This is another type of tilting disc valve available from 1978. The cage is made of titanium and disc out of pyrolitic carbon. There have been a
Why isn't the cooking of vitamin C-containing foods appropriate for vitamin C supply? To obtain vitamin C, for example, from an orange dessert, the vitamin-containing food cann
What is an antigen? Antigen is any substance, particle or infectious agent known as foreign to the body. The contact of the antigen with the body promotes a defense reaction ag
Explain Acute Renal failure Acute Renal failure: Renal failure associated with burns or other trauma or with sharp infection or obstruction of the urinary tract.
Q. What are astigmatism and presbyopia? Presbyopia is the visual impairment in which there is loss of the cililary muscle strength thus reducing the ability of the crystalline
S n ake bite Biting by a poisonous snake is manifested by clinical findings of local swelling and nervous symptoms. E t iology: The poisonous snakes have different typ
How is genetic engineering used to create bacteria capable of producing human insulin? In a production of human insulin by bacteria the human insulin gene is incorporated into
Fever influenza
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