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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
Surface Run-off - Causes of Water Pollution The surface run-off from cultivated lands where inorganic fertilisers, pesticides, insecticides and rich manure are applied and sol
Explain about the Chromium Metabolism? Chromium appears to be absorbed throughout the small intestine, with absorption being higher in jejunum. The mechanism of absorption has
Q Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the p
classification and characteristics
Q. What is Deoxynivalenol? Deoxynivalenol (DON) is a far more common, but much less toxic, trichothecene and is produced by species such as F. graminearum and F. culmorum. LD
Q. Explain Spoilage of Cereals and Cereal Products? Cereals are the main source of energy to human beings. There are several varieties of cereals, of which wheat and rice are t
Collagen Helix Collagen has a large amount of glycine (25%) and proline (and hydroxyproline, 25%). They run parallel, form a right handed super-helix that is stabilized b
What is the greenhouse effect? The greenhouse effect is a phenomenon in which atmospheric gases like CO 2 trap reradiated heat from the Earth, much as the glass panes of a gre
Internal structure of the heart of man Internally there are four chambers in the heart. The upper two chambers are called auricles and the lower two chambers are called vent
Rhythmic fluctuations in the abundance and activity of cell-cycle control molecules pace the events of the cell cycle. • Kinase - a protein which activates or deactivates another
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