LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Beneficial mutations are passed on to several members of a generation, quickly taking hold in a population.
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Unfavorable mutations have a more significant effect on genes than do favorable mutations, so they are spread through the population.
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Natural selection favors beneficial mutations, so they survive and are passed on to future generations.
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Beneficial and unfavorable mutations take hold in the population equally over numerous generations.
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Detailed explanation-1: -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-2: -Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation. Some new alleles increase an organism’s ability to survive and reproduce, which then ensures the survival of the allele in the population.
Detailed explanation-3: -Yes, natural selection increases genetic variation by preserving beneficial mutations and eliminating deleterious mutations. This does not necessarily increase the total number of alleles within a population, but it does influence the frequencies of those alleles.
Detailed explanation-4: -Mutations occur throughout the natural world. Some mutations are beneficial and increase the possibility that an organism will thrive and pass on its genes to the next generation. When mutations improve survival or reproduction, the process of natural selection will cause the mutation to become more common over time.