The extracellular matrix is a dynamic, complex meshwork of proteins and polysaccharides that contributes to the structure and function of a tissue. 

#Id: 7035

#Unit 11. Evolution and Behavior

Neo-Lamarckism - August Weismann cut off the tails of mice for many generations and showed that this mutilation had no effect on the tail length of their descendants

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#Unit 11. Evolution and Behavior

 Alfred Russel Wallace - Who was collecting specimens in the Malay Archipelago, had independently conceived of natural selection.

#Id: 7037

#Unit 11. Evolution and Behavior

Darwin’s evolutionary theory - Evolution as such is the simple proposition that the characteristics of organisms change over time. 

Geometric increase 

Limited food & Space

Struggle for existence 

Variation 

Natural selection

Inheritance of useful characters

Speciation 

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#Unit 11. Evolution and Behavior

Darwin’s evolutionary theory - Common descent

#Id: 7039

#Unit 11. Evolution and Behavior

Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms, not by leaps

#Id: 7040

#Unit 11. Evolution and Behavior

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.