Year 12 Biology Term 4 Revision Sheet, 2017 Genes and traits: DNA, proteins, traits Factors that effect Allele frequency Gene flow (p.581 Common ancestors) Gene Pool Mutations Convergent vs Divergent evolution Define each Provide examples Genetic Drift (p583): The founder effect Isolation o Mechanical, Behavioural, Ecological o Barriers to gene flow Speciation Define Speciation? How are new species formed? Selective pressures Darwin’s theory of evolution What is natural selection? Provide examples of species that support Darwin’s theory natural selection Questions that Darwin was unable to answer? Selection in Action (p577) Genetic resistance Selection and fluctuating fitness (p579) Allele frequency in populations (low and high allele frequencies for diseases) Types of Evolution (Refer to the PowerPoint of the same title) Microevolution Macroevolution o Define each of the above terms o Provide examples for each Phylogenetic trees (p554, 566) How do we group organisms that share homologous features Cladograms: Student activity Can you draw a Cladogram based on shared features?