HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mutations are always harmful.
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Mutations may be helpful.
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Mutations generate the raw material for natural selection.
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Mutations create variety in the gene pool.
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Detailed explanation-1: -Not all the mutations are fatal; and those imparting survival and reproductive advantage to individuals are favored by natural selection. Most of the mutations are recessive and are accumulated in gene pool. As mutations are random, it is least possible for two individuals to have same mutation.
Detailed explanation-2: -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.
Detailed explanation-3: -Answer and Explanation: The correct answer to this question is B. They always cause a change to an organism’s genotype. Regardless of the cause of the change, a DNA sequence is always altered when it mutates.
Detailed explanation-4: -Answer and Explanation: “All mutations are harmful and increase the risk of disease such as cancer” is a false statement. It should read “Some mutation may be harmful and increase the risk of diseases such as cancer, but many are beneficial. The majority of mutations are nearly neutral or harmful.