EVOLUTION
EVOLUTION OF A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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is created by the direct action of natural selection
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arises in response to changes in the environment
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must be present in a population before natural selection can act upon the population
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tends to be reduced by when diploid organisms produce gametes
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Detailed explanation-1: -So we can say that genetic variation must be present in a population before natural selection can act upon because natural selection happened because of the natural order variation in population and genetic variation has wide range of diversifying component.
Detailed explanation-2: -Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation. random mating between organisms.
Detailed explanation-3: -Genetic variation must be present in a population before natural selection can act upon organisms in that population.
Detailed explanation-4: -Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection).
Detailed explanation-5: -Natural selection acts on existing heritable variation. For natural selection to act on a feature, there must already be variation, and that variation must be able to be passed on to offspring.