Genetic Evidence for Stickleback fish's evolution

In the stickleback fish, pelvic-fin reduction resulted from changes in the regulatory switch elements of the Pitx1 gene. In the marine ancestor, the Pitx1 gene is activated in the pelvic-fin region during development to generate the fin. In the pelvic-reduced stickleback, the regulatory switch that normally turns on the Pitx1 gene is either missing or non-functional.

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Channels: Scientific Animations Genetics

Tags: Pitx1,gene sticklebackfish evolution

Uploaded by: ( Send Message ) on 02-08-2007.

Duration: 0m 58s