Biology 1201A Lecture Notes - Lecture 24: Convergent Evolution, Deuterostome, Chordate
Document Summary
Wed, dec. 5/18: lecture 24 patterns in the evolution of. Structural or developmental similarity is more informative than superficial similarity: use molecular data to determine evolutionary relationships. Shared, derived: which traits might be misleading, homoplasy"s --> convergent evolution, homoplasy"s: traits that look the same but have no evolutionary history (not related) Patterns in the evolution of life: eukaryote, animal, deuterostome (mouth and anus development, chordate, vertebrate, mammal, primate, apes + old world monkeys, great apes (hominidae) Classification: organisms are classified according to, monophyletic groups: all taxa that descend from a common ancestor, all life uses the same genetic code all life shares - 50 genes. Ordovician-silurian: most of life was in the sea, 85% sea life was lost. Late devonian: 75% animal species were lost, vertebrates did not reappear for another 10my. Triassic-jurassic: 50% of species lost, opened up habitats on land. Cretaceous-tertiary: 75% of animal and plants species lost, dinosaurs lost.
