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6 Cards in this Set

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What is selective pressure?

•Environmental conditions that select for certain characteristics and against others


•By nature and situational

What is ARTIFICIAL selection?

•Selective pressure exerted by humans on populations in order to improve or modify particular traits


•By humans or conscious human caused conditions

Selective breeding

•People select which organism to breed


•Based on desirable traits; desired by humans; lead to higher frequency of the desirable trait

Natural selection

The process by which random evolutionary traits are selected by nature in a consistent, orderly, non-random way

Natural selection

The process by which random evolutionary traits are selected by nature in a consistent, orderly, non-random way

What's needed for natural selection to occur? (7 steps)

1) organisms produce more offspring than survive


2) organisms compete for limited resources


3)there's variation within species


4)variation is heritable


5)variations make some individuals better suited to their environment


6) better suited = survive longer = traits get passed down


7) TIME (process is slow)