This Click and Learn explains how DNA sequences can be used to generate such trees, and how to interpret them.
West Nile virus infects mosquitoes, birds, and people—with very different consequences.
Comparing features of a 4.4-million-year-old fossil skeleton to those of human and chimpanzee skeletons sheds light on our evolutionary history.
Lactose tolerance, sickle cell anemia, and bitter taste perception are three examples of recently evolved human traits.
Lactase persistence results from a mutation that changes how transcription factors interact, thereby affecting gene expression.
This survey, developed by Horne and Ostberg, will let you determine if you are a morning or an evening person.
Answer the questions in this online quiz to test your knowledge of what determines the sex of a human, a fruit fly, and a snapping turtle.
Paleoanthropology provides an excellent example of the scientific process at work.
Learn about the nature of vector-borne diseases, and the life cycle of the dengue vector mosquito.
Learn the principles of how DNA is sequenced and assembled into whole genomes using the Sanger method, shotgun sequencing, or ultra-deep sequencing.
Answer interactive questions to explore the logic of the Virochip microarray design, particularly how evolutionary relationships can be used to detect new viruses.
Explore principles of taxonomy by sorting seashells according to their morphological characteristics and constructing an evolutionary tree.
Explore the biology of the symbiotic relationship between the Hawaiian Bobtail squid and bioluminescent bacteria Vibrio fischeri.
Understand how quorum sensing works by reasoning through experiments involving genetically-engineered bioluminescent bacteria.
Learn why verifying a person's gender may be harder than you think.
How both gene chips and microarray slides are created.
Small molecules are chemicals that can interact with proteins to affect their functions. Learn about the structure and biological functions of various small molecules like sugar and caffeine.
Different gaits employed by animals and how the nervous system is able to switch between them.
Measuring neuronal activity, generating action potentials, and recording the firing of individual neurons.
An overview of the immune system, concentrating on the roles played by B and T lymphocytes, and the antigen-presentation system.
A brief discussion of what makes a virus a retrovirus, and how they differ from other types of viruses.
Problems associated with adherence to antiviral drugs, and a student activity that mimics adherence to a multi-drug regimen.
An overview and comparison of different regenerative capabilities in many different organisms.
An exploration of current and future therapies.
Learn about the different ways scientists are able to detect when genes are being expressed in various tissues.