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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
Tricuspid Stenosis : Acquired tricuspid stenosis is most often due to chronic rheumatic carditis. Rarely could it be due to right atrial tumors or carcinoid syndrome producing mi
Before the emergence of life of what gases was the earth's primitive atmosphere constituted? The earth's primitive atmosphere was basically produced of methane, hydrogen, ammon
Bile salts or bile acids are polar derivatives of constitute and cholesterol the major pathway for the excretion of cholesterol in mammals. In the liver, the cholesterol is circul
what can we do after reading biology???
Define Classification of Fats and Fatty Acids? You must be wondering in this unit on lipids why we are talking about fats and oils and not using the term lipids. Definitely whe
Define briefly about the Conjugated Proteins? Conjugated proteins are made up of simple proteins combined with a non- proteinous substance. The non-proteinous substance is know
Poultry Mycoplasma gallisepticum causes chronic respiratory disease (CRD) in chickens. The incubation period is 1-3 weeks. In young birds, the disease is less severe than adult
What is the most abundant form under which nitrogen is found in nature? The most abundant nitrogen-containing molecule found in nature is molecular nitrogen (N2). The air is 80
Platyhelminthes (Flatworms) - Regeneration in Invertebrates Between flatworms the turbellarians, (mostly fresh water species and fresh water and terrestrial triclads) routinel
Classification of plants and animals
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