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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.
Explain the Types of cell Reproduction ? One of the major characteristics of living organisms is their ability to grow and reproduce. This is accomplished by cell division. In
Eastern/Western/Venezuelan equine encephalitis This encephalitis causing group of viral diseases of wild birds including pheasants, chickens, turkeys, ducks and pigeons with a
GOLGI APPARATUS Camillo Golgi in 1898 discovered a reticular structure in the cytoplasm of nerve cells with the help of metal impregnation technique using silver nitrate for whic
Q.Explain Chemical changes due to spoilage A food item may have apparently looked safe and wholesome for you to eat, but the rumbling and grumbling in your stomach at night may
(a) What is the distinction among 'breathing' and 'respiration'? (b) What part do 'ventilation' and 'gaseous exchange' play in these processes? (a) Breathing i
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Development and Differentiation of a flowering plant The developmental phases of a flowering plant involve seed germination, vegetative growth, flowering, fruiting and senesce
a) Name the mineral elements needed by (i) bones, (ii) red blood cells, (iii) the thyroid gland b) Which of these elements is (i) present in milk, (b) lacking in milk?
The general mechanism of RNA synthesis by these eukaryotic RNA polymerases is the same as for the prokaryotic enzyme that is: ? The initiation of RNA synthesis by RNA polyme
Name three sources of biofuel
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