What did researchers discover about the genetic mutation causing the loss of pelvic spines?

Select all that apply.

.

It is found in a regulatory region (a “switch”) upstream of the coding region of the Pitx1 gene


It is found in the coding region of the Pitx1 gene.


It results in a protein that is no longer functional.


It occurred in a similar DNA region in freshwater stickleback populations all over the world.