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26.1 Cloning of a Gene
Using recombinant DNA technology, bacteria and viruses can be genetically altered to clone a gene.

The polymerase chain reaction (PCR) makes multiple copies of DNA segments. Analysis of the DNA usually follows.
1. What is recombinant DNA?

2. What is one of the applications of the polymerase chain reaction?
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Animation Quiz
Polymerase Chain Reaction

General Biology Weblinks

DNA Fingerprinting: You Be the Judge
26.2 Biotechnology Products
Bacteria, agricultural plants, and farm animals have been genetically engineered to produce commercially available products.

Agricultural plants and farm animals have been genetically engineered to improve their yield.

Farm animals have been genetically engineered to serve as a source of organs for human transplant patients.

It is now possible to clone animals, and cloning is used to produce multiple copies of farm animals that have been genetically engineered.
3. What are some of the possible environmental benefits associated with transgenic crop plants?

4. What was the major technological drawback that had to be overcome before vertebrates could be cloned?
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Art Quizzes
Production of Bovine Somatotropin
Cloning Experiment

Case Study
26.3 The Human Genome Project
The Human Genome Project has two goals: to genetically map each chromosome and to sequence the DNA bases of each chromosome.
5. If scientists successfully map all genes of the human genome, what purpose does this serve?

6. How many human genes code for proteins?
26.4 Gene Therapy
Gene therapy is now being used to replace defective genes with healthy genes and to help cure various human ills.
7. How do ex vivo and in vivo gene therapies differ?
Case Study
The New York Times: Iceland Sells Genes for Profit

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