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Why is variation beneficial to the speci...

Why is variation beneficial to the species but not necessarily for the individual ?

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When reproduction takes place, new DNA copies are generated. They may show some amount of variations. The variations may not be beneficial for an individual. But when such variations go on accumulating over a longer time span, they may change the species. This change leads to evolution.
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Knowledge Check

  • Species is a

    A
    Group immediately below a phylum
    B
    Closely related interbreeding population
    C
    Taxonomic division of similar general
    D
    Closely related non-breeding population

  • Cardiac output in a healthy individual

    A
    5 ml
    B
    500 ml
    C
    5L
    D
    50 L

  • Which of the following statement is true for variation in organisms? (1) The occurrence of differences among the individuals of the same species is known as variation. (2) Variations decrease the possibilities of survival. (3) The process of evolution decreases the variation in organisms. ( 4) During meiosis, crossing over takes place between the genes and hence, new combinations are formed, which ultimately results in producing variations.

    A
    (1) and (3)
    B
    (1) and (4)
    C
    (2) and (4)
    D
    (2) and (1)

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    If the displacement of a body is zero is the distance covered by it necessarily zero ? Explain with suitable illustration.

    Do all variations in a species have equal chances of surviving in the environment ? Why ?

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