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Why is the sexual mode of reproduction required?

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DNA copying mechanism is absolutely accurate

DNA copying mechanism is not absolutely accurate

The resultant errors are not a source of variation in the population

RNA & DNA copying mechanism is absolutely accurate

answer is B.

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Detailed Solution

Creating two new cells from one involves copying the DNA and the cellular apparatus. The DNA copying mechanism, as we have noted, cannot be absolutely accurate, and the resultant errors are a source of variations in populations of organisms. Every individual organism cannot be protected by variations, but in a population, variations are useful for ensuring the survival of the species. It would therefore make sense if organisms came up with reproductive modes that allowed more and more variation to be generated. Hence, the DNA copying mechanism is not absolutely accurate.

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