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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
Biological Nitrogen-Fixation The process by which molecular nitrogen (N 2 ) is reduced to ammonia (NH 3 ) is called nitrogen-fixation (N 2 -fixation). This is the most importa
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parasexual reproduction
Explain about the Weight Imbalance? You are aware that obesity is one of the major public health problems of the world, Earlier a problem of the developed nations; it is now in
Define minerals Definition of minerals, as it applies to food and nutrition usually refers to the elements other than carbon, hydrogen, oxygen and nitrogen that are present in
Chemical Stress - Atmospheric imbalances At least two components of the environment, oxygen and carbon dioxide that plants require are predominantly in the gaseous form. As yo
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Lactation tetany of mares (eclampsia, transit tetany) Hypocalcaemia in mares causes lactation tetany, which is characterized by abnormal behaviour, in coordination and tetany.
How does circulatory system works in cockroach?
In systematic four types of relationships are studied and they are: a) Relationships of phylogeny (evolutionary descent) or the degree to which two organisms are thought to be r
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