http://www.youtube.com/watch?v=ZlVwOWlwzfo&feature=youtu.be
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Content of Biological Principles at https://sites.gatech.edu/bioprinciples is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Unported License.
It was easy to understand the concept and helped me to review the old modules.
The presentation and hand-drawing is very clear and professional, with good pacing and voice inflection for the speaker. However, the video might be a little bit too long and could be more engaging and entertaining if creative examples, e.g. mitosis and meiosis in an animal, etc. were used.