Explore the convept that DNA and proteins are key molecules of the cell nucleus.

The scientists and experiments that discovered that DNA is coiled into chromosomes are the topic of this article. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

A nice tutorial on DNA structure. The menu at the bottom allows you to view some different information.

This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page. The topic is the study of cell division, mitosis, and cell death.

Many scientists have worked on discovering what genes are "turned on" within cells at different stages of development. DNA arrays and gene chips are techniques that have been developed. This article will help you understand these difficult concepts. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Long after Gregor Mendel knew that something controlled heredity three other scientists finally put his research together with new evidence from microscopes to determine that genes do exist. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Recombinant DNA technology has made it possible to gain insight into how genes work. This concept is further developed in this article with an animated explanation, art gallery, audio/video interviews, biographies, and an interactive problem to solve. An exciting, interesting way to learn about rDNA!

The subject of eugenics tried to explain behavior with simple genetics principles, which we now know is not possible. The subject is handled well. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Eukaryotic cells have separate DNA from mitochondria and chloroplasts which indicates that they were once primitive cells on their own. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page. Here you can see how common genes are evidence for common ancestors.

The link will list a variety of topics about genetics. Click on topic 17 for a very good tutorial on the discovery of DNA. Click along the bottom margin for the different screens.

Early research showed that genes code for proteins. This was based on studies using mutant strains of bread mold. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Watson and Crick knew that there had to be some type of molecule that was important in protein synthesis. That molecule was RNA. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

RNA is now considered to be the first molecule that could transmit information. This article looks at the scientists and experiments that developed this idea. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

An animated pedigree clearly explains the way hemophilia was inherited in the Romanov family. Interpreting pedigrees and sex-linked crosses should be much easier to understand after going through this tutorial.

This article contains information on how DNA is repaired to prevent mutated damage from interrupting DNA processes.

Experiments found that DNA could sometimes recover from damage. This article illustrates how the discovery was made. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Some viruses use RNA and reverse transcription to function. This article covers the scientists and experiments that made this discovery. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

This animation explains how Nettie Stevens research on meal worms unlocked the chromosomal basis of gender.

The discovery that mRNA is not an exact copy of the DNA is the topic of this section from the DNA Learning Center. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.