BIOLOGY 1A03 Lecture : Biology Chapter 19.docx
doinhumolalala and 39849 others unlocked
9
BIOLOGY 1A03 Full Course Notes
Verified Note
9 documents
Document Summary
The polymerase chain reaction (pcr) is an in vitro dna synthesis reaction in which a specific section of dna is replicated over and over to amplify the number of copies of that sequence. It"s a technique for generating many identical copies of a particular section of dna. Although pcr is much faster and technologically easier than cloning genes into a dna library, it is only possible when a researcher has some information about dna sequences near the gene in question. Sequence information is required because to do a polymerase chain reaction, you have to start with short lengths of a single-stranded dna that match sequences on either side of the gene of interest. These short segments act as primers for the synthesis reaction. Primer sequences must be complementary to bases on either side of the gene in question. One primer is complementary to a sequence on one strand upstream of the target dna, the sequence of interest.