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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.
Latitudinal Variations The latitudinal variation of temperature over the earth is the result of two main variables incoming solar radiation and the distribution of lan
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To which direction does the growth of one side of branch, a stem or root induce the structure to curve? Whenever one side of a branch, stem or root grows more than the other si
what is cation and anion? list of cation and anion and its biological function?
How different are the concepts of action potential, resting potential and excitation threshold concerning neurons? Action potential is the maximum positive voltage level achiev
mode of nutrition in follow animal lizard,bird,grasshopper,rat
Contig: Number of uses, all nouns. The term comes from the shortening of the word 'contiguous'. A 'contig' might refer to the map showing placement of a set of clones which comple
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Which photosystem-I or II-most likely evolved first? Describe your reasoning. Photosystem II most likely evolved first, because it changes electrons lost from chlorophyll
Q. Which are the glands present in the epidermis of birds, reptiles and mammals? In the epidermis of reptiles and birds there are practically no glands. In mammals there are se
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