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DNA Replication
Chapter 7: DNA, Genes, and Chromosomes
When DNA replication occurs, the double-helix ladder of DNA splits down the center. Free bases join with the proper base along each side of the opened DNA ladder. The result is two identical DNA molecules that each have half of the original molecule. You can model DNA replication if you…
Try This
- Copy the patterns shown for the DNA parts shown.
- Trace and cut out 12 thymines, 12 adenines, 12 guanines, and 12 cytosines.
- Construct a molecule of DNA using 3 thymines, 3 adenines, 3 guanines, and 3 cytosines. Draw a model of your molecule on a separate sheet of paper.
- Separate your DNA molecule into two long halves. Use the remaining pool of bases to properly match the bases along each half. Draw a model of your molecules on a separate sheet of paper.
Analyze Your Results
- Which bases always pair together?
- How many DNA molecules did you have after replication?
Were they identical?- Based on your model, how accurate is DNA replication?
- How can you explain the accuracy of replication?
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