Changes in an organisms DNA
are rarely beneficial. One source of DNA changes is DNA replication.
During DNA replication, all of an organism's DNA is copied. For
humans, that means copying around 3 billion base pairs each time the
DNA in a cell is replicated. Because faithful DNA replication is so
important, organisms have a number of ways to ensure replication
In this Lesson, we'll look at
the details of DNA replication and how accurate replication is
accomplished. We'll also discuss the consequences of DNA changes.
The structure of DNA provides
an elegantly simple mechanism for DNA replication. One
double-stranded DNA molecule is used to produce two identical
molecules of double-stranded DNA by copying each individual strand