BIOL 100 Lecture Notes - Lecture 3: Jean-Baptiste Lamarck, Sympatric Speciation, Allopatric Speciation
Document Summary
Evolution is descent with modification proposed testable ideas about how species change. Change in allele frequency within a population from one generation to the next. Both fact and theory fact observations of changes in allele frequenices in a population across generations (natural phenomenon) theory mechanisms (explanations) of those observed changes uniformitarianism. Modern geological and physical processes have remained constant over time; changes in nature are gradual catastrophism. Charles lyell -proposed that earth must be really old, since natural processes occur slowly; revitalized uniformitarianism. 1. fitness- the ability to survive and reproduce every habitat contains limited supplies of the resources required for. Changes in the environment change fitness agents of natural selection 1. predators and prey. 2. chromosomal variation natural selection acts on ______________, ___________________ evolve evolution by means of natural selection -selection acts on phenotype, but evolution consists in changes in genotype. Selection does not look forward (evolution always one generation behind)
