Stickleback that live in freshwater do not have pelvic spine

Stickleback that live in freshwater do not have pelvic spines, but have other structures that utilize the Pitx1 protein to develop properly. In the image above, which region would you expect to observe a mutation that causes this pattern?

a)	Region (c)

Controls Controls expression expression in pelvis Protein-coding region in jaw (a) (b) (c) Transcription and translation Pitx1

Solution

a)Region c  Fish without pelvic spines deleted the pelvic switch of the Pitx1 gene.