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Head - Structure of the Sperm
It exhibits a diversity of shapes in different animal groups, e.g., spherical (teleost fishes), rod or lance shaped (amphibians), spirally twisted like a corkscrew (birds), spoon shaped (man), flattened (buffalo) or hooked (mouse and rat) or occasionally round (bivalve molluscs). Some of these shapes may be interpreted as an adaptation to propulsion in fluid media. The genetic functions are embodied in the nucleus; activation of egg during fertilization is basically initiated by anterior cap like acrosome. The nucleus occupies the greater part of head and it also determines the shape of head. During the course of sperm differentiation (spermiogenesis), everything in the nucleus not directly concerned with the transmission of heredity characters is discarded leaving only the actual material of genes (DNA) which is tightly packed within the nucleus.
Adenosine triphosphate (ATP) is a general form in which the energy is stored in living systems; comprises of a nucleotide (with ribose sugar) with three phosphate groups. Energy c
Third Week - Embryonic Development Throughout the third week of development the ICM separates from the uophoblast and forms the flattened embryonic disc, which at first consi
Advantages and Disadvantage of using Turbidity Measurement? Advantages 1. It is an easy, rapid and sensitive technique. 2. Turbidity measurement can be done without destr
Venting of the Heart : It is important that heart does not distend during cardio pulmonary bypass. This is prevented by venting of the left side of the heart by inserting a cannu
herterofertilization
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Involution - Internalization of Mesoderm As by now mentioned, in the frog Xenopus (and probably in other amphibian species as well) the cells of presumptive mesoderm are in t
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