AN237 Lecture Notes - Lecture 15: Pitcairn Islands, Fletcher Christian, Abo Blood Group System
Document Summary
A few individuals from a population start a new population with a different allele frequency than the original population: founder effect, ex. Fletcher christian + pitcairn islands type o blood in central + south america polydactyl in: extra finger (mutation, decreasing total variation of the population. In a malaria risk environment, sickle cell anemia frequency is the highest. Because the malaria parasites don"t like sickle cell. The heterozygote is favored over either homozygote: dominance vs. codominance, heterozygote advantage aka heterosis, balanced polymorphism, natural selection in action, gene flow. Genehadtobebroughttonorthamericafromothermalariarisk environment: heterozygote is generally better than homozygote. Heterozygote advantage leads to balanced polymorphism: micro to macro evolution. How do new species evolve: cladogenesis - branching evolution. Gradual or punctual: anagensis - aka darwinism gradualism/ phyletic evolution. Progressive idea (great chain of being progression) satisfies humans that we are. Chimpanzee and bonobo spilt 1 million years ago separated because of a river: closely related.
