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Discussion 2 - Beaks in Darwins Finches Group of organisms...

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Beaks in Darwin’s Finches - Group of organisms that Darwin studied as a young man - Found that each of the Galapagos islands had their own distinctive flora and fauna o Different species, but still kind of similar, as if they had shared a recent common ancestor - When Darwin started this voyage, he thought he was going to be a geologist o Recognized that the islands are pretty young, younger than the mainland o Endemic Idea is to connect proximate methods to other evolutionary forces - Can’t really do that with a model organism in a lab Words to know: - Mesenchyme o Consists of unspecialized cells - Bmp4 o Signaling molecule that is important for early differentiation in the embryo - Morphological variation: - Growth factors - Craniofacial development - In situ hybridization - RCAS: replication competent avian - Basement membrane: sheet of fibers that anchor down the epithelium - Ectoderm: outer layer of the embryo - Mis-expression - Cis-regulator Why did they want to study bmp4? - Expression in the mesenchyme of upper beaks is correlated with deep and broad beak morphology -
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