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In the last unit we traced the human evolutionary history mostly from a palaeontological viewpoint. Although still fragmentary, the available fossil evidence makes it possible to construct a more or less coherent story of human origin and its development. Besides suggesting a primate ancestory, fossil evidence has indicated various trends in human evolution. Today the modern man is regarded as a climax of the evolutionary process. But several questions are raised as to which direction the human evolution is proceeding now and what direction will it take in the future. Is the be-all and end-all of all the evolutionary process? Or do human beings continue to evolve biologically? It may not be possible to provide a direct answer to these questions since evolution is a long term process and the effects could be visualised only after tens of thousands of years.
Q. What are plasmids? And what is the significance of plasmids for the recombinant DNA technology? Plasmids are circular fragments of DNA that are accessories to the main bacte
Lymphatic Vessels The function of lymphatic vessels is to aid in the return of interstitial fluid to intra-vascular volume. They assist with transport of lipids from th
Differences between Prokaryotes and Eukaryotes It is obvious that there are a number of differences between them. Prokaryotes, like bacterial cells are generally much smaller,
What is peristomium. Describe? The segment behind the prostomium in annelids which contains the oral opening. This segment like the prostomium isn't a true segment and has no s
Among neonates, IE typically involves the tricuspid valve of structurally normal hearts and is associated with very high mortality rates. It is likely that many of these episodes
What is allele frequency? The Allele frequency is the percentage of appearances of an allele in the genotypes of a given population (compared to the other alleles of the studie
Competition - Processes in Succession The aggregation of individuals in an area leads to inter specific and intra specific competition. The competition is usually for
Explain about the Dehydration or Drying? The technique of drying is the oldest method of food preservation practiced by mankind. The removal of moisture, which is actually dehy
Explain glycolysis? Name the two monosaccharides which readily enter the glycolytic pathway. Illustrate a diagrammatic sketch of the microscopic view of a mammalian sperm a
Explain briefly why 'greenhouse' gases lead to global warming. The greenhouse gases do not interfere with the short-wave radiation reaching the Earth from the sun but take up t
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