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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.
Define Iron Factors affecting absorption of dietary iron? We have read earlier that iron in foods occurs either as haem or non-haem iron. Haem iron comprises of iron in combina
The F2 phenotypic ratio from a dihybrid cross with epistasis was 9:3:4. If instead of a dihybrid cross, a double heterozygote was test crossed (crossed to a homozygous recessive in
Ecosystems are so varied in form and structure that whatever has a distinct community of its own, can be called an ecosystem eg. A crop field, grass land, barks etc. all the ecosys
Devonian is the period of geologic time from 410 - 360 million years before the present. Life on land diversified, with amphibians appearing late in this period of time. Plants we
A woman who is heterozygous for a particular X-linked recessive trait marries a phenotypically normal man. What percentage of their sons will show the recessive phenotype?
The gaseous pollutants can be controlled through the techniques of combustion, absorption adsorption and cold trapping. (a) Combustion: Though combustion is a major cause of i
Enumerate the history of neuropsychological The typical neuropsychological exam begins with a careful history taking. Areas of interest include: Medical history of patie
Catalysts are substances that decrease the activation energy of a chemical reaction, facilitating it or making it energetically viable. The catalyst enhances the speed of the chemi
heating a food sample with Benedict''s solution is a test for...
Which one of the following statements about certain given animals is correct? 1. Round worms (Aschelminthes) are pseudocoelomates 2. Molluscs are acoelomates 3. Insects ar
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