A thorough command of chromosome behavior during cell division is an absolute prerequisite to understanding transmission genetics. The keyword meiosis links to a site that reviews key features of mitosis and meiosis and reinforces this information with animations.

Duchenne muscular dystrophy DMD is a wasting disease of muscle that results from an X-linked mutation in one of the largest genes in the human genome, spanning more than 2.3 million nucleotide pairs. It affects about one in every 3,500 newborn boys and has no cure. Early signs usually occur between the ages of 2 and 6 when affected boys are observed to fall frequently, have difficulty getting up from a reclining position, and have a waddling gait. Log onto this keyword site to learn more about Duchenne muscular dystrophy and other inherited diseases of muscle.

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