Physical Anthropology

In: Other Topics

Submitted By KimLeonard
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Parallel Evolution and Inheritance of Quantitative Traits
* Do the similarities in the lateral armor plates of the Threespine Stickleback indicate parallel evolution in a species?
* The differences in plate number and body shape were examined in two populations of threespine stickleback in both a stream in Canada and a stream in Japan. Both populations were feral and completely independent of the other population. The researchers made three hybrid crosses by breeding the Canadian species with other Canadian sticklebacks, Japanese sticklebacks with other Japanese sticklebacks, and one strain of a Candian/Japanese generation. After hatching, the fish were raised separately from each other. They would then kill the fish at 18 months so they could accurately measure the fish’s lateral armor plates. * The lateral armor plates where then measured on each side of each fish. They then took digital picture of each fish using a ruler for reference in each photo. They found that each fish had similarities in the number of lateral armor plates, each differing by only about two or three plates on the left side.
* Parallel evolution was shown heavily between the Canadian and the Japanese strains of the stickleback. The number of lateral armor plates were very similar to start with and the number that the amount of plates was reduced by almost the exact same amount on the next generation in the two different strains. * They also noticed that the body shape had changed by a parallel amount with the two different stickleback strains. They noticed that there was an increase depth in their bodies, distance between the first and third dorsal spine, and the anal fins dorsal length was reduced by the same amount. * They did find that even with these similarities, the fish from both of the strains had their own differences that…...

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