There was a massive earthquake that separated a large population into two groups on opposite sides of a valley. If members of this population remain geographically isolated, what cannot occur?

Sympatric speciation

Explanation:

There may be more than one answer here, but concerning speciation, sympatric speciation can't occur because of the geographic isolation (must be living in the same environment for this to occur).

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.