evodevo2notes2-05

evodevo2notes2-05 - Anth. 143: Evo Devo Pt. 2 and...

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Anth. 143: Evo Devo Pt. 2 and Macroevolution Outline: Mutants o o Cyclopia (holoprosencephaly) o Hypertelorism o Sirenomelia o Stickleback fish What are species? o Biological vs. Ecological Species concept o RIMs o Types of Speciation (Allopatric, Parapatric, Sympatric) Review from last time Blue eyes – only recently emerged and was a mutation. All blue-eyed individuals have a common ancestor. Originally all humans had brown eyes. OCA2 – gene that controls melanin/eye color. Blue eyes = less melanin. This gene limited the production, not turned it off which would be albinism Structural genes > proteins Gene switches “tool kit” Regulatory genes Morphogen – chemical signal, tells developing org. where head and foot is, Noggin – example of ^, tells where to form brain stem Stem cells – give rise to 3 layers (endoderm, ectoderm, and fjkslmdgf)
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Cilia – in dev. Cells help tell left and right New Stuff Errors in development Homeosis- one part of the dev. Embryo is erroneously formed into another, or where person has more/less body parts than normal 1894 – William Batson, british geneticist, wrote book on ^ Discovered among fruit flys. o
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evodevo2notes2-05 - Anth. 143: Evo Devo Pt. 2 and...

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