M ILESTONE M INUTES E VOLUTION Week 5. L AMARCK PROPOSED THE INCORRECT T HEORY OF A CQUIRED CHARACTERISTICS - OBTAINED TRAITS ARE INHERITED.

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Presentation transcript:

M ILESTONE M INUTES E VOLUTION Week 5

L AMARCK PROPOSED THE INCORRECT T HEORY OF A CQUIRED CHARACTERISTICS - OBTAINED TRAITS ARE INHERITED.

C HARLES D ARWIN IS CONSIDERED THE FATHER OF EVOLUTION AND PROPOSED MORE ACCEPTED THEORIES.

C HARLES D ARWIN :  All species produce more organisms than can survive.  There is variation within a population of organisms.  Some variations are favorable for survival, some are not favorable for survival.  Organisms with favorable traits will live to reproduce (natural selection/survival of the fittest).  Adaptation is the only means to overcome environmental stresses, increase survival and reproduce.  Overtime, organisms with the same favorable variations will populate the population (evolution).

E VIDENCE OF EVOLUTION CAN BE SHOWN THROUGH COMPARISON OF FOSSIL RECORDS AND ANATOMY

E VIDENCE OF EVOLUTION : FOSSIL RECORDS ANATOMY  Homologous structures- similar anatomy and similar function (human arm: crocodile leg)  Analogous structures-similar function and different anatomy (bird wing: ostrich wings)  Embryologic Development- comparing the growth and development of plant/animal embryos.  Biochemistry-comparing biochemical pathways with plants or animals.  Relative Dating- the depth a fossil is discovered in the earth’s layers can indicate its approximate age.  Radioactive Dating/Half life -measuring the decomposition of radioactive isotopes to date a fossil.

C HANGES IN GENETIC EQUILIBRIUM WITHIN A POPULATION CAN RESULT IN EVOLUTION

C HANGES IN A POPULATION RESULT IN E VOLUTION  Mutations can cause changes in genetic equilibrium.  Genetic Drift changes genetic equilibrium by chance.  Geographic Isolation- physical barrier divides a population, prevents mating, promotes new species.  Reproductive Isolation -organisms of same species can no longer mate, promotes new species.  Convergent Evolution -display of similar characteristics due to similar environmental stresses  Divergent Evolution- display of different characteristics due to different environmental stresses.