Question

How can a genomic library be prepared?

Answer 1

1. Isolation of Genomic DNA: The first step is to isolate pure chromosomal DNA from the organism whose genome is to be studied.
2. Fragmentation of DNA: The genomic DNA is cut into smaller fragments using specific restriction enzymes that produce fragments with sticky ends.
3. Insertion into Vectors: These DNA fragments are then inserted into suitable cloning vectors that have been cut with the same restriction enzyme to ensure compatibility of ends.
4. Ligation: DNA ligase is used to join the DNA fragments with the vector DNA, forming recombinant DNA molecules.
5. Transformation: The recombinant DNA molecules are introduced into competent host cells (usually bacteria) by transformation.
6. Selection and Screening: Transformed cells are grown on selective media to identify those that contain recombinant DNA.