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!
Primary Egg Envelopes
These are the egg envelopes which develop in the ovary between oocyte and follicle cells in the space occupied by the interdigitating microvilli. Such envelopes have been named variously in different animals.
a) It is named as vitelline envelope or vitelline membrane in insects, molluscs, amphibians and birds.
b) In tunicates and fishes, it is known as chorion. In many sharks and bony fishes the primary envelope has striated appearance and is referred to as zona radiata representing the degraded microvilli of the growing oocyte. The perforation in the zona radiata becomes the micropyle through which the spermatozoa can enter the egg.
c) In mammals, the unstriated and modified zona pellucida is formed as a result of joint efforts of egg and follicle cells. While escaping the Graafian follicle mammalian oocyte carries on the surface of zona pellucida a layer of follicle cells known as corona radiata. The primary envelopes usually stick closely to the egg surface. These later on participate in the formation of fertilization membrane.
what is tay-sachs diseases in human beings as mendal incomplete dominance f2 genration
In Dental Traumatology Traumatic injuries in young kids (8 to 14 years old male > female) are commonly nowadays. Dental traumatic injuries are mostly in anterior teeth
How are bacteria classified according to their need for oxygen? According to their necessity of oxygen bacteria are classified into:- a) Anaerobic (those that survive withou
Define fluorides Metabolism? Soluble fluorides, even at high intake levels are almost completely absorbed from gastrointestinal tract. These include aqueous solutions of fluori
Which of the following statements regarding the separation of DNA fragments using gel electrophoresis is false? A. DNA fragments will migrate towards the positively charged ele
How CAMPYLOBACTERIOSIS occurs in humans C. jejuni frequently contaminates raw chicken. Survey shows that 20-100% of retail chickens are contaminated. Many healthy chickens car
Q. Protein Requirement during congestive cardiac failure? Protein: The protein requirements remain the &me as healthy adult men and women, About 0.8 - lg of protein per kg
What do all organic compounds contain? The key element is carbon. Organic compounds are all carbon-having compounds. By definition, an organic compound having carbon. Alt
How different are animal cells from plant cells? Whereas plant cells are eukaryotic, autotrophic, photosynthetic and have chloroplasts and cell wall, the animal cells are eukar
What is Pressure Support Ventilation (PSV)? In a spontaneously breathing patient, each breath may be augmented with a preset level of pressure. The extent of support depends o
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd