1. How do police catch criminals just by using a few drops of blood?

5. C T T A G C C G T T C G G C A A A T C C A T G A A T T A G G T A
Restriction Enzymes are sequence specific
RestrictionEnzyme
This one recognizes "AATCGG" and cuts between the T and the C
C T T A G C C G T T
C G G C A A
A T C C A T G A A T
T A G G T A

6. A T C C A T G A A T T A G G T A C G G C A A C T T A G C C G T T
The Enzyme cuts in a certain way. It leaves "sticky" ends (unpaired bases that need to find a complementary base)
RestrictionEnzyme
A T C C A T G A A T
T A G G T A
sticky ends
C T T A G C C G T T
C G G C A A

7. A T C C A T G A A T C G G C A A T A G G T A C T T A G C C G T T
A gene can be inserted as long as it starts and ends with the complementary base pairs!
Enzyme
A T C C A T G A A T
T A G G T A
C T T A G C C G T T
C G G C A A
Another enzyme helps seal the new bases in place