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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.
Growth Regulators Besides the major five hormones, polyamines can also exert regulatory control over growth and development at micromolar concentrations. They are widespread a
Q. Can High blood pressure cause coronary sclerosis? High blood pressure causes coronary sclerosis (hardening in early stages, fatty lesions in the inner surface of [he artery
1. What are the examples of helobial endosperm
HEAR T OUTPUT The amount of blood pumped by heart per minute. Heart beat is 72. Pump out blood is 70 ml. This 72 × 70 = 5040 ml. ( 5 litres) blood is pumped in a minute.
Which one of the following statements is correct with respect to AIDS? 1. The HIV can be transmitted through eating food together with an infected person 2. Drug addicts are
Fusion of Egg and Sperm Pro-Nuclei The fusion of the sperm and egg which is the beginning of the fertilization process is completed with the fusion of the male and female pro
Fibroblast is the term applied to a cell of connective tissue which is separated from similar cells by some degree of the matrix material; fibroblasts secrete elastin and collagen
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Consider the evolution of metabolic pathways. Some biologists believe that these pathways evolved from?
How is the early diagnosis of genetic diseases usually done? Genetic disease might be diagnosed in the prenatal period by karyotype analysis, in case of aneuploidies, or by DNA
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