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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
Production of substances interfering with virus proliferation In some cases plants are known to synthesise chemicals that inhibit crucial functions of pathogens. This makes pl
The internal composition of the cell is maintained because the plasma membrane is selectively permeable to small molecules. A lot of biological molecules are unable to distribute b
Name three useful products that can be obtained by genetic engineering. Useful products of genetic engineering are:- A) chymosin, B) Alpha-anti-trypsin, C) hepatitis
What is Rhizopus - Fungi? Rhizopus is a common laboratory contaminant. It is a spoiling mould and found frequently on the surface of bread, fruits and vegetables. It can grow a
a) Water demands vary among communities. Discuss some of the factors affecting water uses. b) A coastal town has a resident population of 8000 people during the winter months
Define the properties of solutions Several properties of solutions are particularly important in food preparations. Amongst these are colligative properties, such as vapour pre
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Elaborate Immune Response system and their categories? The immune response is a group of defenses that the body has developed to combat disease-producing agents, or pathogens.
Ventricular arrhythmias are usually produced by excess catecholamines and vagal withdrawal and occasionally re-entry and triggered activity also plays a role. PVCs are more common
Explain the Combating drug-resistant diseases? The growth of drug-resistant strains of disease-causing bacteria threatens the current effectiveness of cheap antibiotics. This i
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