This Click and Learn explains how DNA sequences can be used to generate such trees, and how to interpret them.
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.
Paleoanthropology provides an excellent example of the scientific process at work.
Explore principles of taxonomy by sorting seashells according to their morphological characteristics and constructing an evolutionary tree.
Learn about artificial and natural selection.
All living humans originated from populations of ancestors who migrated out of Africa less than 100,000 years ago. Learn how scientists have used genetic markers to trace the migration routes and origins of modern human populations.
The record of life on Earth stretches over 3 billion years. Deep time and Earth history are keys to understanding the present.
Finches discriminate between members of their own species and those of a closely related species based on song and appearance.
The fossils of transitional creatures were key evidence for Darwin’s evolutionary theory, but none had been found when he published On the Origin of Species. Now, there are many examples of such fossils, which clearly show that big evolutionary leaps consist of many smaller steps.
Compare and contrast the anatomy of the heart and the circulatory systems of major vertebrate groups and gain insights into their evolution.
Learn about the different ways scientists are able to detect when genes are being expressed in various tissues.
This interactive explores different anatomical features of the human body and what they reveal about the evolutionary history we share with other organisms, including earlier, long-extinct species.