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

1 EVOLUTION

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5 Jean-Baptiste Lamark : 1744-1829 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

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

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

8 HORSE – Equus caballus DONKEY – Equus assinus MULE X

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

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

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

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

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

14 DIVERGENT EVOLUTION : evolution of different features from similar lineages

15 DIVERGENT EVOLUTION : evolution of different features from similar lineages

16 DIVERGENT EVOLUTION : evolution of different features from similar lineages

17 CONVERGENT EVOLUTION : evolution of similar features from different lineages

18 CONVERGENT EVOLUTION : evolution of similar features from different lineages

19 CONVERGENT EVOLUTION : evolution of similar features from different lineages

20 CONVERGENT EVOLUTION : evolution of similar features from different lineages

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22 DIVERGENT same becomes different CONVERGENT different becomes same

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