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  • The rungs of the ladder are made up of four letters — A, T, C and G, which are called bases.
  • Each ladder rung has one base connected to one side, which is linked to another base on the other side.
  • In DNA, "A" always links to a "T," and "C" always links to a "G."
  • The combination of two bases that make up a ladder rung is a base pair.
  • Going up the ladder, step to step, spells your genetic sequence. It might read A-T-G-G-C-C-T-A.
  • The entire set of base pairs in your DNA creates your one-of-a-kind genome.
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