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How does the creation of variations in a...

How does the creation of variations in a species promote survival?

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Variations occur due to secul reprodution and also due to inaccurate copying of DNA. Depending on the neture of variations, different individuals would have different kinds of advantages. For example, bectraria variants which can withstand heat have better chances to survive in a heat wave non-variant becteria having no capacity to tolerate heat wave. Thus, variations in a populaion of a species help in survival of a species.
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(a) What is variation? How is variation created in a population ? How does the creation of variation in a species promote survival ? (b) Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.

What is variation ? How is variation created in a population ? How does the creation of variation in a species promotes its survival ? (ii) Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.

Knowledge Check

  • Assertion : The theory of survival of the fittest is widely misunderstood. Reason : Evolution does not always increase the chances of a species survival and species do not survive when mich chances happen rapidly.

    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 ture 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

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