A concise overview of what happens when a mutation occurs in our DNA, and how that causes some cancers. [1:06]
Human chromosomes explained in this brief description of human cell biology. [0:47]
Using information from molecular research, this 3-D animation shows how DNA is replicated at the molecular level. It involves an enzyme that unwinds the DNA and other enzymes that copy the two resulting strands. [1:07]
Find out about the genetic blood disorder, sickle cell anemia, in this short narration. [0:59]
Learn how bacteria can transfer genetic material to other bacteria through conjugation. [0:23]
A United States map animation showing the spread of the AIDS epidemic from 1981 to 1997. [0:31]
In this lifelike animation, watch what happens inside a host when a malaria parasite-carrying mosquito bites a human. [4:17]
This video clip shows the location of the hypothalamus in the brain of a mouse. Teaching tips included. Quicktime or Windows Media Player formats. [0:33]
See how electrical and chemical signals are used by neurons to communicate with one another at synapse contact points. [1:09]
A narrated animation showing the growth of the human brain during fetal development. [1:40]
Through a simple animation of a cat straddling an obstacle, learn about the activity of the neurons in parietal cortex. [1:03]
Watch how sounds affect the cochlea inside the human ear in this narrated animation. [1:30]
This animation demonstrates how body mass index affects the degree of obesity in an average height human male. [1:21]
A concise explanation and animation of the coronary events leading to a heart attack or stroke. [0:37]
See how dietary fat from food we eat travels through the digestive system, and gets packaged and stored in the human body. [2:07]
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.
See how an X or Y chromosome carried by a sperm cell, determines the sex of the offspring in this video. [5:52]
Find out how cytoplasmic factors in a developing embryo play a vital role in determining which genes to turn on and off for appropriate cell development. [0:56]
See how the three germ layers in early embryonic development eventually lead to the formation of major human organs. [1:29]
Penn State University anthropologist Dr. Nina Jablonski walks us through the evidence that the different shades of skin color among human populations arose as adaptations to the intensity of ultraviolet radiation in different parts of the world. [18:57]