ANT101H5 Lecture 8: Lecture 8
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 the end of old species) appearance of new species due to many generational changes in allele frequencies. 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. Cladistics breaks up homologous structure to form a time scale. Determine ancestral versus derived (modified) homologous traits to determine lineage. Clade: a group of organisms with a common ancestor. A single ancestral species gives rise to 2 or more descendant species. A species way of life considered in the context of its environment (haviland & crawford, The way a species adapts to an environment.
