HumanEvolution-1

HumanEvolution-1 - Human Evolution The origins of...

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Unformatted text preview: Human Evolution The origins of evolutionary thought n Fixity of Species n forms of life and their relationships DO NOT change n Politics Fuedal System n Religion Christianity is taken literally Middle Ages The Scientific Revolution see diversity of humans, animals, and plants Charles Darwin (1809-1882) n HMS Beagle n found fossils of ancient giant animals n Could these be ancestral? Galapagos Islands n species similar, but not identical to each other or mainland Natural Selection It at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of a new species. Natural Selection Those with favorable traits.. Reproduce Unfavorable traitsDie before reproduction Operates on individuals, but the population evolves. What is necessary for Natural Selection? 1) The trait must be inherited. What is necessary for Natural Selection? 2) There must be variation in the inherited characteristics. What is necessary for Natural Selection? 3) This trait must affect fitness (reproductive success). How Natural Selection Works? Environment is the filter in which traits are selected for or against. Mutation Once a cell splits from another cell, it cannot access the DNA of that parent cell .. MUST CREATE COPY (REPLICATION) DNA divides into 2 separate strands, the hydrogen bond between nucleotides breaks Each strand serves as a template for the pairing strand making a copy An enzyme, DNA polymerase I, acts a catalyst for this process *** Mutations occur when there are uncorrected errors in DNA replication, leading to permanent changes in DNA Gene Flow n The migration of organisms resulting in a shift in genetic material....
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HumanEvolution-1 - Human Evolution The origins of...

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