These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping …
These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp.
Biology is designed for multi-semester biology courses for science majors. It is …
Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.
By the end of this section, you will be able to:Describe the …
By the end of this section, you will be able to:Describe the different types of variation in a populationExplain why only heritable variation can be acted upon by natural selectionDescribe genetic drift and the bottleneck effectExplain how each evolutionary force can influence the allele frequencies of a population
This class provides a general introduction to the diverse roles of microorganisms …
This class provides a general introduction to the diverse roles of microorganisms in natural and artificial environments. It will cover topics including: cellular architecture, energetics, and growth; evolution and gene flow; population and community dynamics; water and soil microbiology; biogeochemical cycling; and microorganisms in biodeterioration and bioremediation.
Whether we’re talking about tigers, trees, or tarantulas, evolution happens at the …
Whether we’re talking about tigers, trees, or tarantulas, evolution happens at the level of the population. In this episode of Crash Course Biology, we’ll find out how natural selection, gene flow, genetic drift, and other processes drive changes in populations. We’ll learn about the Hardy-Weinberg equation, how your alleles make you uniquely you, and how some tigers changed their stripes.
Chapters: When Black Bears Are White Genes & Alleles Natural Selection Genetic Drift Gene Flow The Hardy-Weinberg Equation Review & Credits Credits
Hank talks about population genetics, which helps to explain the evolution of …
Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation.
Chapters: 1. Population Genetics 2. Population 3. Allele Frequency 4. 5 Factors a) Natural Selection b) Natural Selection/Random Mating c) Mutation d) Genetic Drift e) Gene Flow 5. Hardy-Weinberg Principle 6. Hardy-Weinberg Equilibrium 7. Hardy-Weinberg Equation
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