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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.
Advantages of Ridgemapping This procedure is a good indicator of the available bone width and helps in understanding the angulation of the available bone to the eventual prosth
different applications of microbiology
Explain the Disadvantages of Fixation? Fixation has following disadvantages also. These are highlighted herewith: (i) It distorts the cell's appearance. (ii) Motility can
what are the modes of reproduction?
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Monkey pox Monkey pox is caused by Monkey pox virus, a member of genus Orthopoxvirus. Transmission generally occurs as a result of close contact with infected animals, mostly thro
Discuss the following term in brief - Adaptive radiation Evolution of a variety of different species from a single common ancestor. Each is adapted for a particular niche, and
GENE INTERACTIONS (POST MENDELIAN GENETICS) Phenotypic expression of a gene may be altered by the influence of other genes. The modification of the normal phenotype of certain
entamoeba histolyca and Giardia lambia were isolated
Name the three irreversible reactions in the glycolytic pathway. The three irreversible reactions in the glycolytic pathway are : Glucose → Glucose-6-phosphate Fructose
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