HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are a source of variation for evolution
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Ther drive evolution by creating mutation pressures
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They are irriversible
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They occur in germ cells but not in somatic cells
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They are most often beneficial to the organisms in which they occur.
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Detailed explanation-1: -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-2: -Mutations are the original source of genetic variation. A mutation is a permanent alteration to a DNA sequence. De novo (new) mutations occur when there is an error during DNA replication that is not corrected by DNA repair enzymes.
Detailed explanation-3: -Mutations are the random changes in genetic material of organisms leading to genetic diversity.
Detailed explanation-4: -Genetic variation is a prerequisite to evolutionary change. In the absence of such variation, no subsequent change can be achieved. Genetic variation is ultimately all generated by mutation. It is therefore clear that mutation is a major evolutionary force that must be studied and understood to understand evolution.