|
Restriction Enzymes Can Cut DNA into Precise Fragments
- Restriction enzymes cut only at specific sequences of 4 to 8 bases
- A long restriction site is rare. Cutting rare sites will produce a few
large pieces of DNA.
- Restriction enzymes with long sites -> small number of large fragments
- Restriction enzymes with short sites -> large number of small fragments
Number of
bases |
Probability |
Average Number
of Fragments for
1 Million Bases
|
Average Size
of Fragment
(Base Pairs) |
|
4
|
1/256
|
3907
|
256
|
|
5
|
1/1024
|
978
|
1024
|
|
6
|
1/4096
|
245
|
4096
|
|
7
|
1/16384
|
62
|
16384
|
|
8
|
1/65536
|
16
|
65536
|
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