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11.1: Activity: Chromosomes and fruit flies

Explore some of the initial experiments by T.H. Morgan that helped to uncover the mechanism of genetic recombination and crossing over.

11.2: Activity: Crossing over

Review the process of crossing over, and its effects.

11.3: Tutorial: Independent assortment and gamete diversity

This tutorial explores how the random distribution of maternal and paternal chromosomes in gametes during meiosis produces new combinations of alleles.

11.4: Tutorial: Human pedigree analysis

This tutorial explores how a pedigree chart may be used to study human genetic disorders.

11.5: Activity: Interactive Punnett square

Use an interactive Punnett square to explore the genetic mechanisms of several inherited diseases.

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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.