Weekly Reflective Response #2

Image result for desert dark and light mouse side by side

This week in AP Biology (at least for what I was there for) we went more in depth into natural selection and adaptation. On Friday, we watched a video on pocket mice that live in the desert, the scientists found that there were two different colored mice (Dark and Light). An estimated 1.7 million years ago volcanic eruptions spewed lava threw the desert where these little mice live, when the lava would dry, wherever it touched would turn black. For the white mice, this black surface made them stand out very obviously and they were easy for predators to spot. The same went for the dark mice living on the light colored sand, they would stand out and be very easy for predators to spot. Naturally occurring mutations in the genetic coding gave the mice the dark colored fur. Over time, the population of dark mice living on the dark rock increased dramatically, because they were better fit to that environment they could reproduce more dark mice that could survive on the dark rock. The light mice on the dark rock continued to die out until there were hardly any light mice left on the dark rock. The light mice on the sand continued to reproduce light mice that could survive, but if they went onto the dark surface that was bad news, same goes for the dark mice going onto the light sand. In nature, when the habitat changes, the organisms have to adapt to those changes if they are going to survive, pocket mice are a perfect example.

 

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