Youtube clip, explains how code of DNA decides order of amino acids in a protein.
Site includes a biography of Mendel, information on his discoveries and an interactive pea breeding experiment
BBC news article on health risks from inbreeding in pedigree dogs.
Diary of a girl who has cystic fibrosis.
Interesting story from BBC News website on semi-identical twins.
Short video explaining X and Y chromosomes from BBC Class Clips.