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How is the process of making variants be...

How is the process of making variants be speed up through the sexual mode of reproduction ? Explain.

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The single cell divides to form two cells and it involves copying of DNA as well as of the cellular apparatus. The mechanism of DNA copying is not absolutely accurate. Sexual reproduction involves fusion of male and female gametes. The variation generated due to DNA copying during gamete formation moves on to the next generation.
Each new variation is made in a DNA copy that already has variations accumulated from previous generations. Thus, two different individuals in a population would have quite different patterns of accumulated variations. Combining variations from two or more individuals would thus create new combinations of variants.
The sexual mode of reproduction incorporates such a process of combining DNA from two different individuals during reproduction.
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