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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
Why Nutrition is important for health Nutrition is one of the basic components of life. It is an essential part of health care. You already know that good nutrition is essent
what are the origin, morphology, active constituents, uses and market preparation of tanco beans ?
ALIMEN T A R Y CANAL Endodermal in origin. Long, 6-9 metres. In herbivorous more long than carnivorous.
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What are the constituent elements of the blood? The blood is made of a liquid and a cellular part. The fluid part is known as plasma and in it there are several substances, suc
How do the products of meiosis I differ from those of meiosis II? In meiosis I, the offspring cells are haploid but every cell contains two copies of the chromosome because th
How to grow root hairs Hairs can simply be seen on the roots of mustard seed grown on a damp flannel. Seeds placed on an earthenware dish standing in a soup plate having water
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