Describe three mechanisms by which genetic variability can be pro

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 Multiple Choice QuestionsShort Answer Type

81. How were mammals better than the other organisms?
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82. Describe three mechanisms by which genetic variability can be produced in nature.


(i) By hybridization, two different individuals (different species or different genera) are made to hybridize. The resultant hybrid will be genetically variable.

(ii) By mutations. Mutations are induced artificially by radiations or chemical mutagens. Thus creating variations and leading to the evolvement of a new species even.

(iii) Recombination- the process of recombination during the cell division results in the variation in the genes. 

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83. Discuss the role of variations in evolution.
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84. The homology in haemoglobin of man and gorilla is 99 per cent. What explanation would you give for this finding ?
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85. Differentiate apes and man.
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86. Name the biggest of the land reptiles.
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87. List the chronological sequence of evolution of genus Homo.
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88. Give important characteristics of the skull of Australopithecus.
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89. Name the man-like primates in the evolutionary history of man which started tool making?
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90. What role fire played in the early evolutionary history of man ?
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