A Case Study in Scientific Inquiry: Investigating Coat Coloration in Mouse Populations

Different coloration in beach and inland populations of Peromyscus polionotus. Source: Urry, Lisa A.. Campbell Biology (p. 20). Pearson Education. Kindle Edition. Campbell Biology Our case study begins with a set of observations and inductive generalizations. Color patterns of animals vary widely in nature, sometimes even among members of the same species. What accounts for … Continue reading A Case Study in Scientific Inquiry: Investigating Coat Coloration in Mouse Populations

Exploration and Observation

Jane Goodall collecting qualitative data on chimpanzee behavior. Goodall recorded her observations in field notebooks, often with sketches of the animals’ behavior. Source: Urry, Lisa A.. Campbell Biology (p. 17). Pearson Education. Kindle Edition. Campbell Biology Our innate curiosity often stimulates us to pose questions about the natural basis for the phenomena we observe in … Continue reading Exploration and Observation

Charles Darwin and the Theory of Natural Selection

Unity and diversity among birds. These four birds are variations on a common body plan. For example, each has feathers, a beak, and wings. However, these common features are highly specialized for the birds’ diverse lifestyles. Source: Urry, Lisa A.. Campbell Biology (p. 14). Pearson Education. Kindle Edition. Campbell Biology An evolutionary view of life … Continue reading Charles Darwin and the Theory of Natural Selection

The Core Theme: Evolution Accounts for the Unity and Diversity of Life

Source: Image by Alexas_Fotos from Pixabay Campbell Biology Evolution is the one idea that makes logical sense of everything we know about living organisms. As the fossil record clearly shows, life has been evolving on Earth for billions of years, resulting in a vast diversity of past and present organisms. But along with the diversity … Continue reading The Core Theme: Evolution Accounts for the Unity and Diversity of Life

Molecules: Interactions Within Organisms

Source: Image by MasterTux from Pixabay Campbell Biology At lower levels of organization, the interactions between components that make up living organisms—organs, tissues, cells, and molecules—are crucial to their smooth operation. Consider the regulation of blood sugar levels, for instance. Cells in the body must match the supply of fuel (sugar) to demand, regulating the … Continue reading Molecules: Interactions Within Organisms

Life Requires the Transfer and Transformation of Energy and Matter

Energy flow and chemical cycling. There is a one-way flow of energy in an ecosystem: During photosynthesis, plants convert energy from sunlight to chemical energy (stored in food molecules such as sugars), which is used by plants and other organisms to do work and is eventually lost from the ecosystem as heat. In contrast, chemicals … Continue reading Life Requires the Transfer and Transformation of Energy and Matter

Genomics: Large-Scale Analysis of DNA Sequences

Source: Image by Arek Socha from Pixabay Campbell Biology The entire “library” of genetic instructions that an organism inherits is called its genome. A typical human cell has two similar sets of chromosomes, and each set has approximately 3 billion nucleotide pairs of DNA. If the one-letter abbreviations for the nucleotides of a set were … Continue reading Genomics: Large-Scale Analysis of DNA Sequences