Name________________________________________________

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)

Sympatric Speciation Examples:

Rates of Evolution

Gradualism:

Punctuated equilibrium:

Artificial Selection Natural 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

Nature chooses which organisms will survive and reproduce!

________________ chooses which traits will be passed on

Population separated by:-______________________________________________________________________________

Population separated by:-___________________________________________________________________________________