9/8 Evolutionary Principles
9/8 Evolutionary Principles ANTH1001
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Date Created: 09/28/14
Evolutionary Principles Galapagos finches good example of natural selection differences led to independent breeding populations the world is constantly changing organisms have to adapt evolution is made up of tiny changes building on available variations What Darwin didn t know still several competing theories today DNAgenesgt how is variation inheritedmaintained where does new variation come from how much time this took other processes beyond natural selection Abiogenesis Origins of Life scientific community still doesn t have a complete answer to this yet Darwin avoided this MillerUlrey amp co spontaneous formation of amino acids and other organic compounds across different conditions add heatlight to puddles volcanoes thermal vents oceans beneath ice sheets sources of organic compounds could be extraterrestrial replication metabolism selection and evolution Not Quite Life biological properties but not living weirdly folded proteins that convert normal proteins to be like them when in the brain it is bad no DNA weird organic systems can propagate genetic material can t reproduce outside of host can t do anything wo a host can evolve newly discovered 2003 don t know much about them physically large some replication machinery but still can t replicate by themselves possibly degenerated bacteria no metabolism probably very common genetically dissimilar to viruses no nucleus no membrane bound organelles bacteria E Coli archaea extreme environment dwellers single cell occur in aggregations plants animals amp fungi many make up more complex biological systems earliest evidence of this life was 16 billion years ago membranes provide gradients across which reactions cancan t occur control complex chemical reactions nucleus chloroplastsmitochondria maybe ribosomes see next bullet possibly originated from independent organisms consumed by a cell but did not die endoplasmic reticulum ribosomes where proteins are synthesized made up of RNA and protein possibly made more complex life possible cells that have been differentiated from embryonic stem cells note ethical debate surrounding use of embryonic stem cells make up different types of tissues half of genetic component of an organism sperm amp egg