BIO120H1 Chapter Notes -Mutationism, Common Descent, Ginkgo

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15 Oct 2013
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Paley argued that the existence of well adapted organisms was similar to the existence of a watch there is a designer just as there is a watchmaker. Species undergoes genetic change over time due to changes in the dna, which originate as mutations. Theory does not predict that species will be constantly evolving or how fast they evolve. Takes many generations to produce a substantial evolutionary change. Strong natural selection leads to fast evolutionary change paces are dependent on evolutionary pressures. Speciation is the evolution of one species into two different groups that can t interbreed. Group was split, and over time, developed differences. The common ancestor x between species is called the missing link. Vast majority of species go extinct, others can live millions of years without speciation (gingko trees) Flip of speciation: all species trace back to a common ancestor. Those that are modernly more closely related have more recent common ancestors.