This link is to a website from the University of Utah. It covers the basics of Y12-Y13 Genetics and covers such topics as ‘What is DNA? What is a chromosome? What is a protein? What is Heredity? What are traits?’ etc
The pace is slow enough that you can make your own notes during the animation or you can simply click through frame by frame and work at your own pace.
There is also a link to ‘What is Meiosis and Mitosis?’ that many of you will find useful to cement these concepts.