EVOLUTION. Jean-Baptiste Lamark : 1744-1829 most famous for incorrectly theorizing on the process of evolution He thought that as a giraffe stretches.

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Presentation transcript:

EVOLUTION

Jean-Baptiste Lamark : most famous for incorrectly theorizing on the process of evolution He thought that as a giraffe stretches its neck to reach for food, its neck grows longer; this trait is passed to offspring did not realize that acquired traits are not genetic

SPECIATION : the development of a new species Sometimes the variation among organisms is too great; eventually they could become separate species

SPECIES: a population of organisms that can produce fertile offspring able to reproduce

HORSE – Equus caballus DONKEY – Equus assinus MULE X

GEOGRAPHIC Isolation : two populations are separated by geographic barriers such as rivers, mountains, bodies of water, etc. Ex: Albert Squirrel and Kaibab Squirrel

PANGAEA : a supercontinent that formed over 300 million years ago Began separating 200 million years ago Continents continue to shift today

BEHAVIORAL Isolation : two groups of a population exhibit different behaviors which separate the population Ex: Eastern Meadowlarks & Western Meadowlarks have different mating songs

TEMPORAL Isolation : two groups of a population exhibit different times of breeding Ex: flowers blooming in different seasons

REPRODUCTIVE Isolation : the DNA of two species is too different to produce fertile offspring Ex: horse and donkeys produce non-fertile mules

DIVERGENT EVOLUTION : evolution of different features from similar lineages

DIVERGENT EVOLUTION : evolution of different features from similar lineages

DIVERGENT EVOLUTION : evolution of different features from similar lineages

CONVERGENT EVOLUTION : evolution of similar features from different lineages

CONVERGENT EVOLUTION : evolution of similar features from different lineages

CONVERGENT EVOLUTION : evolution of similar features from different lineages

CONVERGENT EVOLUTION : evolution of similar features from different lineages

DIVERGENT same becomes different CONVERGENT different becomes same