BIOL 1001 Lecture Notes - Lecture 34: Gradualism, Speciation, Punctuated Equilibrium
26 Mar 2017
School
Department
Course
Professor
Document Summary
It"s the history of biodiversity-process, diversification, adaptations of species over a long period. Use molecular, morphological analysis of fossil species to analyse macroevolution. In in blue diagram there is gradual change b/t the species where overtime the specie differentiate more. In pink diagram, it shows sudden change or burst in phenotypic changes- called punctuated equilibrium. Punctuated equilibrium- evolution or sudden changes or bursts . If evolution is gradual, we would see transitional fossils. Transitional forms are preserved to give records & provide evolutionary history. If evolution is quick, we expect big changes rapidly. Transitional fossils are not preserved to show intermediate states. Change in one gene can cause rapid evolution. Rapid evolution can occur due to environmental changed. Isolation of a population by a barrier- genetic drift. Pattern in the fossil records will record a large period of stasis (constant) then a jump in a characteristic. Irregular preservation of transitional fossils can explain the jumps is transitional fossils.
