BIOLOGY 1M03 Lecture Notes - Lecture 14: Thylacine, Common Spotted Cuscus, Tiktaalik
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Phenetic: criterion of similarity (morphological or genetic distance) Cladistic: criterion of synapomorphies (morphological or genetic traits) Assume maximum parsimony fewest # of mutations on tree is correct answer (cid:1) Probabilistic: criterion of synapomorphies (morphological or genetic traits) Assume maximum likelihood likeliest tree is the correct answer (cid:1) (cid:1) (cid:1) Transitions and convergence in the tree of life . Convergence of placental and marsupial mammals: anteater and numbat, lemur and spotted cuscus, wolf and tasmanian wolf. Phylogeny of vertebrate animals, convergence of swimming mammals on the fish body shape. Start with moving onto land gain limbs. At some point move into water lose limbs. Fish like scales and gills but has the flattened head of a crocodile. Unusual fins with thin ray bones, but also sturdy bones so it can prop itself up in shallow water. Evolutionary transition between swimming fish and their descendants, the tetrapods four-legged vertebrates (cid:1)
