BIOLOGY 1M03 Lecture Notes - Lecture 13: Cambrian Explosion, Symmetry In Biology, Frisbee
4 Feb 2018
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Document Summary
Events in the phanerzoic eon (palaeozoic, mesozoic, and cenozoic eras) Evolutionary development; modularity, switches and gradients, genes and complexity, gene and genome duplication. There are several limitations of the fossil record: Habitat bias some habitats preserve fossils better than others. Taxonomic bias some organisms have hard bodies that preserve better than soft bodied organisms. Temporal bias there may be overrepresentations of things that were around more recently vs. anciently (because a lot more has happened since then that could have disturbed the fossils) Abundance bias things that were plentiful have more fossils than things there were rare. Even though fossils are biased and incomplete, they are still informative. Many major lineages of animals appeared during of just after the ce. Fossil records can tell us when major body types showed up, many phyla appeared near the time of the ce (mollusks, arthropods, worms, and other deeply diverged lineages)
