Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Describe how life history patterns are influenced by natural selection
Explain different life history patterns and how different reproductive strategies affect species’ survival

By the end of this section, you will be able to do the following:

Explain the different ways natural selection can shape populations
Describe how these different forces can lead to different outcomes in terms of the population variation

Discusses conditions needed for the Hardy-Weinberg Law to hold true and demonstrates calculations involving allelic frequencies to illustrate this principle.