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.
Q. What are the etiological agents of malaria? The etiological agents of malaria are protozoans of the genus Plasmodium. There are four different kinds of plasmodia that cause
classificatn of aschelminthes
Can you help explain this question in fairly simple terminology? A certain sample of DNA has a Tm of 65oC, while another has a Tm of 58oC. What can you tell about the relative n
1. You have two bags of polymer. Bag A has 10 kgs of polymer with weight average molecular weight of 336.6 kg and Bag B has 20kg of polymer with weight average molecular weight 39
Q. Conditions Necessary for outbreak of botulism? The following conditions are necessary for an outbreak of botulism: 1. Presence of spores of C. botulinum of type A, B o
Q. What is hypertension? The Hypertension is a disease in which the arterial blood pressure, during systole or during diastole, is abnormally high. The Hypertension, or high
Explain Functions of proteins Functions of proteins are included herewith. These include: Source of energy: Constituent amino acids can be deaminated and metabolized to
Periimplant Probing Depth In contrast to natural teeth, for which the average periodontal probing depth (PD) has been reported, the physiologic depth of the periimplant sulcus
Q. Investigation of aortic regurgitation by Chest X–Ray? Left ventricular dilatation produces cardiomegaly on chest radiograph. Ascending aorta is often prominent. Egg shell ca
Describe the Male Reproductive System? In addition to the primary sex organs, the testes, there are accessory structures that store, nourish, and activate the sperm, and conduc
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