Download Evolution Worksheet #2

Biology 11 Unit 3
NAME: ________________________ Block: ______
Evolution Worksheet #2
1) Differences among individuals of a species is referred to as
_____________________
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2) What is the definition of a Species?
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3) An inherited characteristic that increases an organism’s ability to survive and reproduce
in its specific environment is called an ____________________________________________
4) When the members of two populations cannot interbreed and produce fertile offspring
________________________ _______________________ has occurred.
5) Is the following sentence true or false? Genetic variation is found only in wild organisms
in nature. ____________________
6) What does the phrase struggle for existence mean?
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7) What does sexual reproduction contribute to the process of natural selection?
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8) Darwin called his idea that each living species has descended, with changes, from other
species over time: _____________________________________________________________
9) What is speciation?
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10) List and describe 3 ways reproductive isolation occurs.
1. ________________________________________________________________________
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Biology 11 Unit 3
2. ________________________________________________________________________
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3. ________________________________________________________________________
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11) What is an example of temporal isolation?
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12) Does the phrase “survival of the fittest” mean only the strongest will survive? Explain
why this is or isn’t true. (Darwin never actually said this, by the way)
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13) What process would an animal breeder use to produce cows that give more milk?
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14) What is a Gene Pool?
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15) How does Genetic Drift lead to a change in a population’s gene pool?
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16) Describe how Directional Selection can cause a population to evolve. Use an example.
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17) Describe how Disruptive Selection can cause a population to evolve. Use an example.
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Biology 11 Unit 3
18) Describe how Stabilizing Selection can cause a population to evolve. Use an example.
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19) How old is planet Earth? ________________________________________________________
20) In the geologic time scale, what Era are we presently in? ___________________________
21) In the geologic time scale, what Period are we presently in? _________________________
22) What era makes up almost 90% of Earth’s history? _________________________________
23) How long did this particular era last? _____________________________________________
24) How long ago did prokaryotes first appear? _______________________________________
25) How long ago did eukaryotic cells first appear? ____________________________________
26) How long ago did the first multicellular organisms appear? __________________________
27) What percent of all species that have ever lived are now extinct? ____________________
28) Explain the concept of Punctuated Equilibrium, and describe how it differs from
Gradualism.
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29) Structures that may look different and have different functions, but develop from the
same embryonic tissue, are called ______________________
_______________________
30) What does Speciation mean?
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31) The process where a single species evolves through natural selection into diverse forms
that live in different ways and fill different niches is called ___________________
___________________.
32) Who appeared first – dinosaurs or mammals? _____________________________________
33) For how many years did dinosaurs “Rule the Earth”? _______________________________
Biology 11 Unit 3
34) What is Convergent Evolution and give an example of it.
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35) Explain what Co-evolution is and give an example of organisms that have done it.
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36) Using the example of the peppered moths from England, describe how natural selection
can change a species over time.
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