Week One Worksheet: Natural Selection Name: ___________________________________ Scenario One: There

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Week One Worksheet: Natural Selection
Name: ___________________________________
Scenario One:
There are two types of beetles on the island of Arcandia – beetles that eat during the day (diurnal) and
beetles that eat only at night (nocturnal) The birds on Arcandia seem to ONLY eat the diurnal beetles
During the day, the nocturnal beetles are inside the trunks of trees, escaping predation In the
springtime, each surviving female beetle lays about 500 eggs on the bottom side of the tree leaves, but
only 100 of these eggs survive long enough to reproduce 

1 Identify the types of variation in this beetle population, and which beetles were selected for (natural
selection is acting in their favor), and which were selected against (natural selection is acting
against their favor) in the space below Explain how you made this determination 

2 Determine which beetle type is most fit in its environment, and explain your choice using what you
know about natural selection in the space below 

3 Predict how the beetle population will change over time, and explain how natural selection is
working in this population of beetles in the space below Scenario Two:
In this scenario, there are two different colors of mice Some mice are white in color, while others are
dark brown The main predator of the mice is the lynx The lynx is able to catch about 80% more of the
darker mice than the white mice because the white mice are better camouflaged Each female mouse
(white and brown) produces about 35 offspring per year 

1 Identify which mice were selected for, and which were selected against, and explain your choices in
the space below  2 Explain what would happen if the environment were to change, becoming warmer, and the snow
melted in the space below Describe how this would change which mice were selected for and
against  3 Predict how the mouse population will change over time, and explain how natural selection is acting
on that population in the space below Page 2 of 2