That's not true at all. Essentially every time you have heard of any disease linked to a gene its because of the Human genome project. 23 and me, that is also thanks to HGP. Lots of cancer research has also been done, identifying markers for cancer.
You might not be aware of it, but has been vital for anyone genetic advancement.
Honestly the best thing is to learn how to fall without getting hurt. And how to bail safely if you lose control of the horse. That's some of the first things you should have been taught when you were learning to ride.
Best thing to do when falling is tuck and roll. Keep limbs from getting stepped on, get away from the horse, and prevent a hard landing.