What is the evolutionary importance of DNA copies not being perfectly identical?
Answer and explanation
Correct answer: It can provide a source of heritable variation.
The governing concept is variation, which is necessary for evolution. DNA copying is highly accurate but not perfect, so small changes may arise. If such a change occurs in reproductive cells and is passed to offspring, it becomes heritable variation. Natural selection may then favour or eliminate it. Therefore, option C is correct; the other choices incorrectly describe reproduction, acquired traits, or organism survival.
Frequently asked questions
What is the correct answer to this question?
It can provide a source of heritable variation.
Why is this the correct answer?
The governing concept is variation, which is necessary for evolution. DNA copying is highly accurate but not perfect, so small changes may arise. If such a change occurs in reproductive cells and is passed to offspring, it becomes heritable variation. Natural selection may then favour or eliminate it. Therefore, option C is correct; the other choices incorrectly describe reproduction, acquired traits, or organism survival.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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