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Evolution Lecture Notes Part III
Microevolution
 When organisms change in _____________________ over time (their traits change)
 Does not create a NEW species
 Ex: _________________________________________
Macroevolution
 Much bigger evolutionary changes that ________________________________________
 Ex: Darwin’s ________________ separated for so long, they evolved into separate species
Natural Selection revisited
 New ___________________________ sequence are constantly being generated in a population's gene pool
›
some of these changes will be beneficial and result in traits that allow ________________and survival
›
Some will be __________________________traits and become less common
Speciation
Geographic Isolation
 When geographic isolation results in a new species it is called __________________________________.
 A population has been separate for long enough and develop so many different traits that they can no longer
____________________________!
Geographic Separation:
 A ______________________________
 A canyon.
 Rivers, streams, or an _______________.
 A desert.
Allopatric Speciation Examples:
Separated by __________________
Separated by __________________
Separated by __________________
Behavioral Isolation:
 When behavioral isolation results in a new species (NO geographic separation) it is called ________________
______________________.
Behavioral differences:




___________________________
Food to eat
Habitat (Type of tree to live in)
Communication (different noises, songs, interactions)
Population
separated by:______________
______________
______________
______________
______________
_____________
Sympatric Speciation Examples:
Population separated by:__________________________
__________________________
__________________________
Rates of Evolution
Gradualism:
Punctuated equilibrium:
Artificial Selection
 You chose the rose, a dog-breeder chose
the dog, and a farmer chose which tomato
he wanted to grow
 ____________________________ which
traits will be passed on
Natural Selection
 Nature chooses which organisms
will survive and reproduce!
 ________________ chooses which
traits will be passed on