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15.1: Tutorial: Genetic testing: Identifying the sickle-cell allele

This tutorial explains how restriction enzymes and gel electrophoresis can are used to test for genetically transmitted diseases.

15.2: Tutorial: Constructing a DNA library

This tutorial demonstrates how a DNA library is created

15.3: Activity: The polymerase chain reaction

See how the polymerase chain reaction is used to make millions of copies of discrete segments of DNA in a short period of time.

15.4: Tutorial: Human cloning

This tutorial explores how therapeutic cloning may be used to produce stem cells that have a wide range of medical applications, and explains how this process differs from reproductive cloning.

15.5: Activity: Genetic engineering

This animation explores how plasmids can be used to genetically engineer a tastier strawberry.

15.1: Process Animation: Constructing a DNA library

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15.2a: Process Animation: Human Cloning: Therapeutic Cloning

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15.2b: Process Animation: Human Cloning: Reproductive Cloning

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15.3: Process Animation: Genetic testing: Identifying the sickle-cell allele

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W. W. Norton & Company has been independent since its founding in 1923, when William Warder Norton and Margaret D. Norton first published lectures delivered at the People's Institute, the adult education division of New York City's Cooper Union. The Nortons soon expanded their program beyond the Institute, publishing books by celebrated academics from America and abroad. By mid-century, the two major pillars of Norton's publishing program—trade books and college texts—were firmly established. In the 1950s, the Norton family transferred control of the company to its employees, and today—with a staff of 400 and a comparable number of trade, college, and professional titles published each year—W. W. Norton & Company stands as the largest and oldest publishing house owned wholly by its employees.