Meiosis is used to make sperm and egg cells. During meiosis, a cell's chromosomes are copied once, but the cell divides twice. During mitosis, the chromosomes are copied once, and the cell divides once. For simplicity, cells are illustrated with only three pairs of chromosomes.
The miracle of life is featured in this wonderful series of short videos, journal entries, and flash segments. A variety of topics are covered in this well written, authoritative piece.
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.
Online mitosis activity offers the student the opportunity to identify, classify, calculate, and graph the phases of mitosis. Explanations of each phase, actual cells are displayed for classifing and gathering data in this comprehensive tutorial.
An inside look at the process of mitosis cell division. [1:30]
This animation describes the structure of a prokaryotic cell and how it is altered to allow binary fission to occur.
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.