How does DNA replicate
Before DNA replication, a chromosome consists of one molecule of DNA (one double helix). As replication begins, enzymes break the hydrogen bonds that hold the double helix together. The two DNA strands unwind and separate.
What'd damages DNA
Replication errors may occur after a cell’s. DNA gets broken or damaged. DNA polymerases do not copy damaged DNA very well . Mutation- a permanent change in the DNA sequence of a cell’s chromosome