Time 0 End of cycle 1 End of cycle 2 End of cycle 3 End of cycle 4 End of cycle 5 (8) (22) FIGURE 9.18 Exponential Amplification of Target DNA During PCR, mid-length fragments are amplifled linearly (arthmetically), whereas the discrete-stzed target DNA, referred to as PCR product, Is amplifled exponentially. After 30 cycles of PCR, more than a billion molecules of PCR product will have been synthesized.

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