Ed asked in Science & MathematicsBiology · 4 weeks ago

Why is genetic variation necessary to the process of natural selection? What processes provide genetic variation and how do they work?

4 Answers

  • 4 weeks ago

    If a species had no variation there would be no evolution of the species. Mutations, in replication and structural molecules permits for variation over time.

    Twins have little variation where as siblings have more. The information constructing the persons, twins or siblings, is either equal or different even to the slightest degree. We share in common with most apes 99.9% of our DNA structure, and less and less with more convergent effects of evolution, i.e. other species.

  • CRR
    Lv 7
    4 weeks ago

    Natural selection can only for or against traits that already exist in the population.

    One source is gene flow which introduces traits that already exist in another population.

    Another source is mutation which almost always causes a genetic defect. Mostly this produces detrimental variations that are selected against.

    Occasionally a genetic defect is beneficial. One example is desert mice. These normally have a light brown hair but there is a defect that damages the pigment control system resulting in excess pigment and black fur. While this is detrimental to mice living in sand it is beneficial to mice living in black lava rocks. Natural selection causes the black mice to increase in the black rock country and decrease in the sand country.

  • Zirp
    Lv 7
    4 weeks ago

    What processes provide genetic variation?

    copying errors, aka mutations

    and gametes having only half of the parent's chromosomes

  • 4 weeks ago

    If there is no genetic variation, then there is nothing for selection to work upon.

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