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NEET Biology The Living World / जीव जगत Question Bank Assertion and Reason

  • question_answer
    Assertion                :       Human ancestors never used their tails and so the tails expressing gene has disappeared in them.            Reason        :       Lamarck?s theory of evolution is popularly called theory continuity of germ plasm. [AIIMS  2005]

    A)             If both the assertion and the reason are true and the reason is a correct explanation of the assertion

    B)             If both the assertion and reason are true but the reason is not a correct explanation of the assertion 

    C)             If the assertion is true but the reason is false

    D)             If both the assertion and reason are false

    E) If the assertion is false but reason is true

    Correct Answer: D

    Solution :

               If humans share ancestry with other primates, then we should expect to see remnants of that common ancestry in our genes. For example, tails. This characteristic is still exhibited occssionally in atavism. According to current evolutionary theory, the ancestors of humans lost their tails about 25 million years ago, when apes (tail-less primates) diverged from monkeys (tailed primates). Theory of the continunity of the germplasm was given by Weismann.


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