Pbs Learning Media: Genetic Variation

Scientists study ice sheets because they influence weather and climate, playing a role in atmospheric and ocean circulation. Ice sheets can also have huge impacts on global sea levels because they store so much water. Explore this...

This video segment adapted from NASA's Goddard Space Flight Center explains how and where hurricanes develop. Learn how El Nino events alter the course of atmospheric circulation. Includes background reading material and discussion...

Learn about thermal energy, also known as heat or heat energy, and the ways in which it can move from one object to another,

In this lesson, students watch a video and animations that relate Isaac Newton's three laws of motion to baseball and apply what they've learned about these laws to another sport or other real-life situation.

Students learn about the giant impact hypothesis for the Moon's formation, and how the Apollo Moon rocks have contributed to scientists' understanding of the Moon.

Students learn how various kinds of data and information can be gathered to create a biodiversity timeline that serves as evidence of changes in a population of a species.

This video segment from Evolution: "Why Sex?" explores the "sweaty T-shirt experiment," which showed that humans may unconsciously be drawn toward a specific kind of genetic variation in a mate.

This image of polydactyly illustrates one symptom of Ellis-van Creveld syndrome, which is commonly found in the Amish. Ellis-van Creveld is one example of the founder effect and genetic drift.

Why did sex evolve? The likely answers, in this essay written for the PBS series "Evolution" by science journalist Matt Ridley, may surprise you.

Three choices of virtual worlds to enter: a vulture, a wolf or a shark world. Once inside these worlds view videos, play games, and discover the ecosystems of these wild animals.