m ilestone m inutes e volution week 5. l amarck proposed the incorrect t heory of a cquired...
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MILESTONE MINUTES
EVOLUTIONWeek 5
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LAMARCK PROPOSED THE INCORRECT THEORY OF ACQUIRED
CHARACTERISTICS-OBTAINED TRAITS ARE INHERITED.
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CHARLES DARWIN IS CONSIDERED THE FATHER OF EVOLUTION AND PROPOSED MORE ACCEPTED THEORIES.
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CHARLES DARWIN:
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).
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EVIDENCE OF EVOLUTION CAN BE SHOWN THROUGH COMPARISON OF
FOSSIL RECORDS AND ANATOMY
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EVIDENCE 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.
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CHANGES IN GENETIC EQUILIBRIUM WITHIN A POPULATION CAN RESULT IN
EVOLUTION
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CHANGES IN A POPULATION RESULT IN EVOLUTION
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.