Macroevolution

Lecture 6a: Macroevolution Macroevolution

Macroevolution ,[object Object],[object Object]

Species- what are they anyway? ,[object Object],[object Object]

Species ,[object Object],[object Object],[object Object]

Reproductive Barriers ,[object Object],[object Object]

Prezygotic Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Behavioral isolation: Different dewlaps in Anolis lizards

Mechanical isolation: Watersnake hemipenes

Postzygotic Barriers ,[object Object],[object Object],[object Object]

Hybrid Sterility: Both mules and zonkeys are sterile

Types of Speciation ,[object Object],[object Object],[object Object]

Allopatric speciation in Galapagos finches

Adaptive radiation in cichlid fish, species have evolved to eat different food sources and to feed in different ways

Fossils ,[object Object],[object Object],[object Object]

Geologic Time ,[object Object],[object Object],[object Object]

Speciation ,[object Object],[object Object],[object Object],[object Object]

Mass Extinctions ,[object Object],[object Object],[object Object]

Continental Drift ,[object Object],[object Object],[object Object]

Pangaea: its formation 250 mya was probably the cause of the Permian Extinction

Meteorites ,[object Object],[object Object],[object Object]

Systematics ,[object Object],[object Object],[object Object]

Phylogenetic Trees ,[object Object],[object Object],[object Object]

Phylogenetic Tree of chordates

Anatomy ,[object Object],[object Object],[object Object]

Thorny devil (Australia) Horned lizard (US) Analogous structures- horns on two lizards

Homologous structures- front limbs of several vertebrates

Using DNA to determine relationships ,[object Object],[object Object],[object Object]

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