1. Explain why, when PCR is used to amplify the same region of DNA from two…

1. Explain why, when PCR is used to amplify the same region of
DNA from two different
people, the size of the DNA fragment(s) generated may be
different?
2. What characteristic of the DNA molecule makes it possible to
use electrophoresis to
separate DNA molecules by size? Explain why this characteristic is
important for
electrophoresis and what part of the DNA molecule creates this
characteristic.
3. You are performing PCR. After four cycles of PCR, how many
double-stranded copies of
the region that you wish to amplify do you have for every
double-stranded copy that
you began with? How many do you have after five cycles?