Chapter 20 - Processes of Evolution - 20.5 - Multiple Factors Account for the Maintenance of Variation in Populations - 20.5 Recap - Learning Outcomes - Page 442: 2

In sticklebacks, the developmental gene Pitx1 codes for a transcription factor that enables the production of plates and spines. This gene is functional in marine sticklebacks, but inactive in some freshwater populations of the fish. This mutation is found in isolated populations, demonstrating parallel evolution between freshwater and marine sticklebacks.

In sticklebacks, the developmental gene Pitx1 codes for a transcription factor that enables the production of plates and spines. This gene is functional in marine sticklebacks, but inactive in some freshwater populations of the fish. This mutation is found in isolated populations, demonstrating parallel evolution between freshwater and marine sticklebacks.