Write a detailed summary (between 200 and 500 words) about this film

you need to watch the video below:

And for full credit, you need to:
1) write a detailed summary (between 200 and 500 words) about this film
2) You need to mention clearly which are the mutations that she investigated and how she finds the connection between the intensity of UV radiation and skin color.

You need to mention both hypotheses that she investigated, and clearly state which one is the mechanism by which UV intensity could provide a selective pressure on the evolution of human skin color