Darwin a Beak shapes of Galapagos Finches, Galapagos Sea lizards, and pigeons breeds, also studied fossil records. At that time genetics were not known about.
Molecular evidence à 1953 DNA structure was discovered, study genetics (genomics), study proteins (Protenomics)
DNA Hydridisation àDNA complementary bases A-T C-G, H2 bonds between bases broken of DNA from chimp and human, DNA strands allowed to anneal/stick back together, The more bases that are complementary between the species the more each strand will stick together. Therefore the more similar the species are.
DNA profiling à DNA fragments ran through electrophoresis gel to compare similarities
DNA Molecular Clocks à look at the number of random mutations in a species DNA, more mutations the longer the species has been evolving.
- Evolution observed:
o HIV exposed to new drug à within days resistant strains have evolved.
o Eastern US coast Asian Shore Crab introduced & eats Blue Mussels by cracking open shells. à Within 15 years the Blue Mussels have evolved thicker shells.
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