Explore the body's immune system to understand how a virus enters the body and how the human body fights against the viruses like the mumps virus and HIV.

The miracle of life is featured in this wonderful series of short videos and journal entries. A variety of topics are covered in this well written, authoritative piece.

[Free Registration/Login may be required to access all resource tools.] Sexual reproduction combines gametes from two parents. Gametes are produced by a special type of cell division known as meiosis. Meiosis contains two rounds of cell...

College-level biotechnology course highlighting a science basis for bioengineering focusing on molecular cell biology and systems biology. Course contents include video lectures and interviews of bioengineering faculty, lecture notes,...

Brought to you by Get Body Smart, students can learn about the human nervous system through this easy-to-access tutorial. Sections include Major Organs and Divisions, Sensory and Motor Divisions, Somatic Divison, Sample Somatic Divison...

Understand what happens to a cell during mitosis.

This informative resource features an overview of genetic material: DNA, chromosomes, genomes, homologous chromosomes, sister chromatids, and haploid/diploid.

This interactive site provides animations and activities in several areas of physiology. The images are simple, but clear. The accompanying text provides a good description of the process being shown.

Find out about the basics of mitosis and meiosis with this comparison chart. Then read the article, study the diagrams, and watch the videos to go further into the subject.

Take this interactive, multiple-choice quiz over mitosis, then review your score and any missed questions at the end.

A biology course for high school students.

[Free Registration/Login may be required to access all resource tools.] DNA must replicate (copy) itself so that each resulting cell after mitosis and cell division has the same DNA as the parent cell. DNA replication occurs during the S...

This article provides a discussion of DNA and how it replicates. Includes a chromosome map of a human male, a close-up of chromosomes just before cell division and a close up of a DNA molecule.

Questions related to processes of cell division, differentiation, and specialization.

The phases of mitosis are described and the splitting of a cell into two daughter cells at the end of it.

Read a brief introduction to mitosis, and then click on the 5 phases to read details and view photos of each in progress. Photo examples are excellent.

[Free Registration/Login may be required to access all resource tools.] Tutorial serves as an introduction to chromosomes. It defines genes, chromosomes, and homologous chromosomes, while providing an explaination of chromatids and...

Key facts about Down Syndrome are available on this page--just roll over the icons. For more detailed information, use the left navigation to explore causes, diagnosis, treatment, and more.

The differences between mitosis and meiosis are explained in this resource. Includes labeled diagrams showing what happens during each and a chart giving an overview of their differences.

Try these fifteen multiple-choice review questions over concepts in cellular reproduction.

Try this five question, self-checking quiz over the process of meiosis.

Use diagrams to help understand meiosis and mitosis.

An informational text about mitosis and its role in reproduction. A question sheet is available to help students build skills in reading comprehension.

This brief tutorial illustrates the difference between asexual and sexual reproduction in organisms. Check your understanding with the mouse-over review questions.