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  • IMAT 2013 Q42 Biology

  • Nicolas Sanchez

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    June 21, 2021 at 9:35 am
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    The increase in the frequency of one phenotype in a wild population of fish could be due to:

    1. an advantageous mutation.
    2. increased reproductive success of individuals with that phenotype.
    3. a change in the environment.

    A. 3 only

    B. 1 and 2 only

    C. 1, 2 and 3

    D. 2 and 3 only

    E. 1 only

  • Ari Horesh

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    June 22, 2021 at 11:54 am
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    The increase in the frequency of one phenotype in a wild population of fish could be due to:

    An advantageous mutation.Increased reproductive success of individuals with that phenotype.A change in the environment.

    Advantageous mutation – a mutation causing a change in the genotypes, that creates a difference in a phenotype could lead to a beneficial phenotype and therefore could lead to the increase of this phenotypes among the fishes.

    Increased reproductive success of individuals with that phenotype – The increase in effectiveness in one trait may lead to a decrease in the efficacy of other characteristics as a result. This is important to understand because if specific individuals within a population have a particular trait that raises their reproductive fitness, this trait may have developed at the expense of others. Those fish fits better to the environment (higher fitness), and the new phenotype is now spreading faster than the other phenotypes of other fishes within the same species.

    A change in the environment – The difference in the environment will cause only species with a particular phenotype to survive depending on the change. If the temperature suddenly goes down and the phenotypes of the fish are to have more fat content, you can expect this phenotype to increase in frequency in that population of fishes.

    All of the statements are correct.

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