ANT101H5 Lecture Notes - Lecture 9: Ecological Niche, Continental Drift, Adaptive Radiation
Document Summary
Human diversity is seen as the result of microevolutionary forces (gene changes within a population) small changes in allele frequencies acting on the human gene pool. Vs macroevolution (mass changes that can lead to new species and end of old species appearance of new species due to many generational changes in allele frequencies. Principles of classification - classify animals based on their evolutionary ancestry based on homologous structures (represent an ancestry) Analogies - structures may have similar function but have a diff composition and have diff developmental stages) Do not pass through similar stages during embryonic development organisms do not share a common ancestor. Structures possessed by 2 different organisms that arise in a similar fashion. Pass through similar stages during embryonic development organisms that share a common ancestor. Systematics - group all homologous structures together and say they have a common ancestor. Giving the traits a time scale, see which ones are more derived by breaking up the traits.
