By counting the number of sites to which ORC binds, we can estimate that there are about 400 origins of replication in the yeast genome. This means that the average length of a replicon is -35,000 bp.

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#Unit 11. Evolution and Behavior

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

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#Id: 3162

#Unit 11. Evolution and Behavior

Natural selection was Darwin’s brilliant hypothesis, independently conceived by Wallace, that accounts for adaptations, features that appear “designed” to fit organisms to their environment.

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#Id: 3163

#Unit 11. Evolution and Behavior

 Orthogenesis- “Straight-line evolution,” held that the variation that arises is directed toward fixed goals.

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#Id: 3164

#Unit 11. Evolution and Behavior

Mutationist- Theories were advanced by some geneticists who observed that discretely different new phenotypes can arise by a process of mutation.

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#Id: 3165

#Unit 11. Evolution and Behavior

Ronald A. Fisher, John B. S. Haldane and Sewall Wright- which showed that mutation and natural selection together cause adaptive evolution.

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#Id: 3166

#Unit 11. Evolution and Behavior

 Neutral theory of molecular evolution- Developed by Motoo Kimura, who argued that most of the evolution of DNA sequences occurs by chance (genetic drift) rather than by natural selection.