ANT101H5 Lecture Notes - Lecture 9: Cladistics, Allele Frequency, Macroevolution
24 May 2016
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Document Summary
Human diversity is seen as the result of microevolutionary forces small changes in allele frequencies acting on the human gene pool. 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. Categorize organisms based on homologous traits that they share. Determine ancestral versus derived (modified) homologous traits to determine lineage. Clade: a group of organisms with a common ancestor. Cladistics can give you a relative timeline and relationship between organisms. 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, Adaptive radiation (huge diversification of species to exploide this new environments or ecological niches)
