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!
Tetrasporic Embryo Sacs
In this group neither of the meiotic divisions is accompanied by wall formation so that at the end of meiosis all the four haploid nuclei remain in a common cytoplasm forming what is termed a coenomegaspore. A tetrasporic embryo sac is more heterogeneous than a bisporic embryo sac because the four products of meiosis involved in its formation are genetically different. The nuclear behavior in tetrasporic embryo sacs is quite variable. The arrangement of the four nuclei in the coenomegaspore before the beginning of post-meiotic mitosis is of three types:
(A) 2+2 arrangement; two nuclei at the micropylar ad and two of the chalazal end
(B) 1+1+1+1 arrangement; one nucleus at the micropylar end, one at the chalazal end, and two placed laterally, one in each side, and
(C) 1+3 arrangement; one nucleus at the micropylar end and three at the chalazal end. Depending on whether nuclear fusion occurs or not, the number of the post-meiotic mitosis in the coenomegaspore and final organisation of the embryo sac, tetrasporic embryo sacs are of many types.
what will happen to a plant kept in dark for 72 hours
what are the general characteristicss of porifera
Q. Learning objectives of coronary artery disease? • describe the various forms of coronary heart diseases, • enumerate the risk Factors (genetic and environmental) in causati
Therapeutic Accurate identification of the infecting organism is the key to successful treatment. Antibiotics as per the sensitivity study in high doses IV is given.
Endoplasmic reticulum (ER) is the network of membranous tubules in the cytoplasm of a cell; involved in production of the phospholipids, proteins, and the other functions. Rough E
Define Use of Soy Protein Concentrates in Bakery Products? Unlesss higher protein fortification levels are necessary, there is no special reason for using soy protein concentra
Results: Largely depends on the LV function. In most centres surgical mortality is 3 to 4 percent. For patients with severe LV dysfunction the immediate and late results of sur
Q. Antimicrobial Barriers - proliferation of microorganisms? The first barrier is the integument: a physical barrier to protect the food, e.g., the shell on eggs, the skin on
Explain Control of Oedema in Nutritional Care? Low levels of circulating proteins lead to oedema due to loss of colloidal osmotic pressure to maintain the normal fluid shift me
Disability evaluations after injuries: (a) Explain the following terms: "duration of disability" and "degree of disability". (b) Explain how degrees of disability after injur
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