Revision notes site for AQA A level Biology (not clear if all new spec is covered) – revision guide style notes, topics in bullet points, useful for revision.
Ecology Fuseschool videos
Ecology videos from FuseSchool on Youtube – there are 40 videos here for GCSE on different ecology topics – not all will be relevant to your syllabus but many will, and they are short bitesize chunks ideal for revision.
Biology A2 videos Snaprevise
Videos covering revision of new A2 (year 2) AQA course, presented by a recent student, you need to sign up to site to watch them.
Useful site for revision, many topics covered with short multiple choice quizzes, keep your score and see your progress. Is a US site so not specific for A level specifications, but you will still find it useful, as it covers How Science Works type questions as well as many relevant other topics.
Meselson Stahl experiment
Comprehensive explanation with diagrams of the Meselson Stahl experiment to prove semi-conservative replication, from Khan Academy site.
Humans can now print genetic code and engineer life
From Futurism site – article explaining synthetic biology, includes video.
For new GCSE Biology (9-1) – revision site based on multiple choice questions for revision (so not IGCSE specifically)
The difference between homeobox and Hox genes
Article which helped me to understand the difference in these terms (OCR)
The immune system
Useful revision summary on this topic from Biology Innovation site, includes diagrams and embedded videos on humoral and cell mediated immunity.
Digestion and absorption of fats
Useful page on digestion and absorption of fats, including diagrams and short multi choice quiz.
Lots of multiple choice quizzes here for GCSE biology (not specific syllabus, use the ones that fit!). Site is mobile friendly. Good for quick checks of topics that you have revised, quizzes give useful feedback and there are also flashcards and links to other resources.
Plants’ epigenetic secrets
Article from The Scientist on plant epigenetics and inheritance of DNA methylation. Interesting background reading, goes into more detail than you need.