Evolution 6b

Evolution 6b - Hagfish Perch Example from text, with a...

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1 Hagfish Perch Salamander Lizard Example from text, with a twist…. Crocodile Pigeon Mouse Chimpanzee + + + - Keratinous scales Cont Incisor - - - - - - + Giz -- -- -- -- + + -- - Example as given in the book, with 3 exceptions: (1) I added “gizzard” (to match book); (2) We’ll add “continuously growing incisors;” (3) We’ll use hagfish, not lamprey; - -- Cont Incisor - - - - Total 0 1 2 4 Keratinous scales + Giz -- -- -- -- - - + - 5 6 6 5 Total by trait: 7 6 5 2 1 2 2 3 1 Add up totals: by trait and species + + -- -- + + -- --
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2 CLADOGRAMS: Do it Yourself Guide 1) Tally traits and species, but WORK ALONG BY TRAITS (not by species) 2) Look for the oldest ancestral trait (it will be *the most common* trait) 3) Look for the “outgroup” species (it will share only the oldest ancestral trait, if that) Cont Incisor - - - - Total 0 1 2 4 Keratinous scales + Giz -- -- -- -- - - + - 5 6 6 5 Total by trait: 7 6 5 2 1 2 2 3 1 Oldest common trait (most ancestral): Jaws! Outgroup = Hagfish (not even the oldest trait!) First species to add (has only 1 of common traits): Perch + + -- -- + + -- -- Build your cladogram… Hagfish (Outgroup) Perch Lizard Jaws Crocodile Pigeon Mouse Chimpanzee
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Evolution 6b - Hagfish Perch Example from text, with a...

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