This week I was teaching my G11 students the Genetics section of the syllabus and showed them an online narration on sickle cell aneamia. I thought I would share the website from which it came.
http://www.montereyinstitute.org/
From there if you go to the HippoCampus link on the top right you come across some excellent online resources
I then went straight to biology
http://www.hippocampus.org/Biology
Check out the courses which takes you to a series of folders
http://www.montereyinstitute.org/courses/AP%20Biology%20I/nroc%20prototype%20files/coursestartc.html
with resources or alternatively work through textbook correlations
http://www.hippocampus.org/Biology?view=Textbooks
And perhaps try their online simualtions
http://www.hippocampus.org/Biology?view=Media
I think you will be pleasantly surprised.