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Mate Choice in Spiders

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Scientists investigated how males choose their mates in a species of sexually cannibalistic spiders.
Pelvic Evolution in Sticklebacks

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Scientists used SNP genotyping in populations of freshwater stickleback fish to determine the genetic mutations responsible for the impaired development of pelvises and spines.
New Laetoli Footprints and Hominin Body Size

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Scientists were excavating a site in Laetoli, Tanzania when they uncovered two new sets of hominin tracks located about 150 meters south of the tracks found by Mary Leakey in the 1970’s. They estimated the heights of the two individuals using the size and shape of the footprints.
Origins of Antibiotic Resistance

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Scientists collected bacteria from locations that had never been exposed to humans or modern antibiotics to determine if antibiotic resistance is newly evolved since the introduction of antibiotics or has evolved independently.
Mimicry in a Diverse Community of Arthropods

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Researchers exposed arthropod mimics that use a golden patch to warn of unpalatability to predators with different prey preferences to determine how effective their warnings were.
Dating Corn Domestication Using Carbon Isotopes

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To study the change in diet as human populations changed lifestyles from hunter-gatherers to agriculturalists, scientists measured carbon isotopes in the collagen tissues of human skeletons from North America.
Thermoregulation in Dinosaurs

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Grady and colleagues compared dinosaur fossil evidence with evidence from living animal species to shed more light on the type of thermoregulation that dinosaurs used—ectothermy, endothermy, or mesothermy.
Selective Breeding in Maize

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Researchers performed the longest-running, controlled artificial selection experiment to study whether they could increase the protein concentration of maize (corn) by selective breeding.
Origin of a Gene Mutation Causing Early-Onset Alzheimer’s Disease

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This activity analyzes a published scientific figure from a study of a family that has a high prevalence of Alzheimer’s disease.
Amylase Copy Number and Diet

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A team of scientists investigated whether there is a correlation between the number of AMY1 gene copies and the type of diet (high-starch or low-starch) of a population.
Effects of Natural Selection on Finch Beak Size

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Rosemary and Peter Grant studied the change in beak depths of finches on the island of Daphne Major in the Galápagos Islands after a drought.
Schooling Behavior of Stickleback Fish from Different Habitats

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A team of scientists studied the schooling behavior of threespine stickleback fish by experimentally testing how individual fish responded to an artificial fish school model.