Ch. 17 - Recombinant DNA Technology

Klug - Essentials of Genetics 10th Edition

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Klug 10th Edition

Ch. 17 - Recombinant DNA Technology

Problema 12

Capitolo 17, Problema 12

If you performed a PCR experiment starting with only one copy of double-stranded DNA, approximately how many DNA molecules would be present in the reaction tube after 15 cycles of amplification?

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Understand that PCR (Polymerase Chain Reaction) amplifies DNA by doubling the number of DNA molecules each cycle, assuming 100% efficiency.

Identify the initial number of DNA molecules, which in this case is 1 double-stranded DNA molecule.

Recognize that after each cycle, the number of DNA molecules doubles, so the number of molecules after n cycles is given by the formula: $N = N_0 \times 2^n$, where $N_0$ is the initial number of molecules and $n$ is the number of cycles.

Substitute the given values into the formula: $N_0 = 1$ and $n = 15$, so the expression becomes $N = 1 \times 2^{15}$.

Calculate the value of \$2^{15}$ to find the approximate number of DNA molecules after 15 cycles.

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Polymerase Chain Reaction (PCR) Process

PCR is a technique used to amplify specific DNA sequences exponentially by cycling through denaturation, annealing, and extension steps. Each cycle ideally doubles the number of DNA molecules, allowing for rapid multiplication from a small initial amount.

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mRNA Processing

Exponential Amplification

In PCR, the number of DNA molecules doubles with each cycle, leading to exponential growth. Starting with one DNA molecule, after n cycles, the number of molecules is approximately 2^n, assuming 100% efficiency.

Initial Template Quantity and Cycle Number

The starting amount of DNA and the number of PCR cycles determine the final quantity of DNA. Beginning with a single double-stranded DNA molecule and performing 15 cycles results in roughly 2^15 DNA molecules, illustrating the power of PCR amplification.

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Bacteriophage Life Cycle

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