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Oogenesis
Oogenesis is the formation of ovum from oogonial cells that are formed in the ovary from primordial germ cells. And as in spermatogenesis it involves meiosis to produce haploid ovum. You have learnt in the section on spermatogenesis that the differentiation of sperm occurs after the meiotic events. In oogenesis the process of first meiotic division is very prolonged; and it is during this process that growth and differentiation of oocyte take place. In many animals most events related to oocyte differentiation occur during prophase I of first meiotic division. In animals which produce yolk-laden eggs, this phase is divided into
Evolutionary relationship among various animal groups is depicted in the cladogram given below. P, Q and R respectively shown: a. Vertebrae, hair and four limbs. b. B
How is a disease-resistant plant selected for successful breeding? Why is the process of fertilisation in a flowering plant referred to as double fertilisation? Explain. Nam
Q. What do you mean by Current Impediments? Given the impressive list of past achievements, we expect that quantitative process to biological problems will continue to repay us
Self Help Group: The first and perhaps the most influential of substance abuse rehabilitation is Self Help Group. The self help programme was founded in 1935 by two men, Dr. B
The aqueous fluid that fills the nuclear region is known as karyolymph, or nucleoplasm. In the fluid there are proteins, enzymes and other significant substances for the nuclear me
Explain the Assessment of Zn Status? Sensitive indices for assessing zinc status are unknown at present. Static indices, such as zinc concentration in plasma, blood cells and h
Q. Briefly explain about Type Specimens ? The specimens on which the names of the species are based are kept as type specimens. Do not replace these specimens because these wi
Relapse of infective endocarditis usually occurs within two months of the discontinuation of antimicrobial therapy. The relapse rate for patients with native-valve endocarditis cau
Cryptococcosis Cryptococcosis is a pulmonary, meningeal or systemic mycotic disease of human beings and animals. It may be acute, subacute or chronic. The disease is caused by
Explain the Occurrence of Vitamin B 1 Vitamin B 1 occurs widely in the vegetable kingdom. The richest sources for vitamin B 1 , as you may already know, are yeast, grain ge
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