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Evolution

Short Answer Type

91. Try to trace the components of human evolution.

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Long Answer Type

92. Briefly state the major theories of origin of life. Which one of them has scientific basis ?

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93. State the hypothesis of Oparin and Haldane about the primeval earth condition. What do you understand by Haldane’s hot, dilute soup ? State its significance.

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94.

Summarise Miller's simulation experiment for organic synthesis. Comment on its efficacy.

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95.

Using internet and discussing with your teacher, trace the evolutionary stages of any one animal say horse.

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Short Answer Type

96. What is variation ? Name the basic processes that cause variation among organisms. Discuss the role of migration in evolution.

Variations. The features which differ among the individuals are called variations.

Causes of variation. Mutation, recombination, gene migration, genetic drift and natural selection.

Role of Migration. Few populations are isolated from the other populations of the same species, usually some migration takes place if the migrating individuals breed within the new population then immigrant will add new alleles to the local gene pool of host population and lead to variations.

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