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Q. Concerning events during the periods of life how different is the gametogenesis in men and in women?
The formation of spermatogonia in men takes place during the embryonic period and formation of sperm cells however is a continuous process that begins in the puberty and goes on until old age and sometimes during all the remaining life of the man.
In women all oogonia are formed before birth and oogonia turn into oocytes I that enter the first division of meiosis (meiosis I) this division however is interrupted at prophase and continues only in puberty. After the beginning of menses an egg cell is released during each period and if fecundated it finishes the meiotic division and oogenesis stops after menopause (cessation of the menstrual activity) and the climacteric period of life begins.
Explain Demography, Demographic Transition and Demographic Cycle We know that population of different countries in the world is always changing. For some countries like India a
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Q What are the corals? Corals are characterized by their polypoid shape, slow growth and sessility and secretion of a solid skeleton made of calcium carbonate. Numerous coral i
There are several kinds of pollution, main among them are as follows:
The different organs of the gastrointestinal system Mouth or buccal cavity - Teeth 32 Permanent and - Tongue Pharynx Oesophagus Stomach Small Intestine
Purpose of the preparation of isolates from a protein The major purpose of the preparation of concentrates and isolates from a protein source is to increase the concentration o
The next step in the nitrogen cycle is the assimilation of inorganic nitrogen in the type of ammonia into organic nitrogen-having compounds. Total organisms assimilate ammonia by
Q. What is Normalisation of Inverted T-Waves? In patients with flat or inverted T-waves at rest, the evolution to an upright T-wave has been considered by some to be a sign of
Evolution: This deals with the origin of newer types of organism from the previous ones by modification involving genetic changes and adaptations. Evolution also called as biologic
EARTHQUAKES An earthquake with its terrible aftereffects is one of the most frightening and destructive phenomena of nature. It can be defined as a sudden movement of
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