A short, simple explanation of Gregor Mendel’s work and simple gentetic crosses:
GCSE Bitesize – Inheritance, a tutorial (4m 46s):
B9.3 Revision notes in downloadable word document
BBC Short Circuit Genetics – a 19m video.
TEXTBOOK REVISION
IGCSE Biology: Coursebook, chapter 14, p. 199 & pp.201 – 204
Here are some videos about genetic diseases: Sam’s story (cystic fibrosis) & CF short movie; sickle cell anaemia; what is Huntington’s disease?