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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.
What is signified by saying that in relation to a given trait conditioned by a gene with two different alleles the gametes are always "pure"? To say so that the gametes are pur
How can coacervates be formed of phospholipids or polypeptides? Phospholipids are amphipathic molecules, i.e., they present a polar portion and a nonpolar portion. In contact w
similarity between pisces & mammals about dirhynous condition......
1. What are the examples of helobial endosperm
Phylum Tracheophyta Tracheophytes mean vascular plants. Tracheophyta includes ferns, the gymnosperms and the flowering plants. They have appeared some 400 million years ago, an
FOSSILIS A TIO N - The organisms are preserved and fossilized when they are buried in the ice, in an oil rich soil, in the lava of volcano, in swamps, in desiccated deser
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NUCLEUS First described and christened by Robert brown 1831, a nucleus is the largest and most important organelle of eukaryotic cells. It is membrane bound and generally locat
Q. How different are animal cells from plant cells? While plant cells are eukaryotic, photosynthetic, autotrophic and have chloroplasts and cell wall, the animal cells are hete
Q. Colony collapse disorder in honey bees? Honey bees (Apis mellifera) are social insects and live in colonies in hives. Honey bees were introduced from Europe to the USA to po
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