Dont forget this is 2nd grade, lol I didnt learn about genetics until grade 8 biology. Maybe the question can be "Can I keep a snake as a pet?" The hypothesis can be "A snake can be kept as a pet if it is properly cared for."

The pupose of the experiment could be "to develop a proper environment for a captive snake" and the methods could be on how to set up an enclosure and care for the snake. You could dismantel one of your simpler enclosures (a tub or a small tank) then put it together as if you had just bought it. Take pictures of each step putting it together maybe