Written by a physician who has a child with Down Syndrome, this article reviews basic genetics and explains the occurrence of Down Syndrome as a result of nondisjunction in cell division. Includes normal and Down karyotypes....

This is an excellent PowerPoint presentation that explains what chromosomes are. Many slides are also accompanied by detailed notes.

This is a great lesson plan that combines Karoytypes and evolution. Students will recognize that the chromosomes of chimpanzees and humans are remarkably similar, then correlate that to their evolutionary relationship.

A self paced tutorial covering chromosomal testing and the many types of conditions resulting from chromosome abnormalities.

Great for a quick check of facts related to detection and common abnormalities. Use these for a test review.

Understanding how chromosomes, DNA and genes all work together can be confusing. The author has explained how chromosomes fit into the picture in clear language.

Part of a site on genetics, this page explores DNA as a forensic science. Explains how and why DNA can be used to convict or acquit a criminal from wrongdoing using forensic DNA analysis. Teacher resources too.

Travel deep into the human body to see exactly where your DNA resides. From the NOVA: Cracking the Code of Life Web site.

The Genetic Science Learning Center presents the world of heredity and traits including activities to better comprehend the science, clear explanations of aspects of heredity, and an interactive opportunity.

Learn all about genetics and how it works in this interactive teaching aid that highlights the study of genes using colorful animated illustrations.

[Free Registration/Login may be required to access all resource tools.] Discusses how mutation or abnormal numbers of chromosomes result in genetic disorders.

This game has students matching pairs of chromosomes to determine if there are any extras, indicating Down Syndrome.

This comprehensive study guide covers the main terms and concepts needed for a unit on human chromosomes and genes.

This study resource from Khan Academy provides practice questions for the MCAT. "Cellular division" questions are provided on this resource.