[Campbell Biology P.595] Which of the following statements accurately describes the gene exp... | Practice Question

Which of the following statements accurately describes the gene expression patterns of Pitx1 in marine versus lake stickleback embryos, as presented in the "Results" section?

• A: In marine stickleback embryos, Pitx1 is expressed only in the mouth region, while in lake stickleback embryos, it is expressed in both the mouth and ventral spine regions.
• B: Pitx1 gene expression is identical in both marine and lake stickleback populations, indicating no difference in regulation.
• C: In developing marine stickleback fish, Pitx1 is expressed in both the ventral spine and mouth regions, whereas in developing lake stickleback fish, it is expressed only in the mouth region.
• D: The study found no significant differences in Pitx1 gene expression patterns between marine and lake stickleback embryos, but confirmed differences in coding sequence.