DNA Structure and Replication

ID #2070

Before the two parent chromatids are split, they are obviously dsDNA, but are they still antiparallel? I'm confused about this, because if they are supposed to have identical base sequences, then how can they be antiparallel? Wouldn't they just be parallel then?

Yes, absolutely, the strands are always antiparallel to each other. And please remember, there's a huge difference between being complementary and being identical. Imagine a strand that's eight guanines, or GGGGGGGG. What would be an identical strand to this? Another one with 8 guanines, right? But what would the complementary strand be? It would be CCCCCCCC, which is not the same thing as the original strand.

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