The title of this chapter really caught my attention and once I finished reading the chapter I realized how interesting DNA could really get. I remember learning about ZPA in bio, freshmen year, but seeing it again after 2 years really intrigued me to finish this chapter. As Shubin continued to explain various experiments that were done by his fellow colleagues I learned that not only is ZPA a key factor in making our pinky look differently than our thumb, but that if ZPA was transferred to another part of the body it would create a mirror image of its normal set, which just shows that ZPA is vital in the body part’s development. Even though, ZPA is the main ingredient in differentiating looks, but DNA needs to be known to control the digits to be formed, bringing us back to DNA. The experiment of skates and sharks showed me that the discovery that all fins or limbs are build by similar kinds of genes, but all have evolved from new DNA; showing that humans, and all other living creatures have evolved from other creatures that go way back. This chapter really opened my eyes on how our our fingers are distinct from the other and reveals that our bodies our more complicated than they seem on the surface.
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