BIO120H1 Lecture Notes - Continental Drift, Woolly Mammoth, Genetic Drift
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BIO120H1 Full Course Notes
Verified Note
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Document Summary
evolution erodes our sense of self, and our morality. two ideas that completely rejected god: natural selection and evolution. parts of the evolutionary theory: evolution- organisms undergo genetic change overtime depending on pressures, gradualism- it takes many generations to produce a substancial change, speciation(or splitting)- species split from a common ancestor. The common ancestor b/w descendant groups is called the missing link . The groups that split can no longer interbreed (unattractive mates, or sterile offspring etc) Speciation does not happen very often, but when it does, the number of opportunities for future speciation are doubled: common ancestory- flip side of speciation, means we have a common ancestor. Mammals and reptiles are joined by having an amniotic egg nested hieracy. If speciation is true, then common ancestry is true: natural selection- survival of the fittest. Wooly mammoth got coolderthose with think hair genes survived, passed on genes. Mutations sometimes lead to the perfect design (rhinos with antlers)
