AP BIOLOGY Student Exploration: Rainfall and Bird Beaks Gizmo
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AP BIOLOGY
Institution
AP BIOLOGY Student Exploration: Rainfall and Bird Beaks Gizmo
Student Exploration: Rainfall and Bird Beaks
Vocabulary: adaptation, beak depth, directional selection, drought, evolution,
natural selection, range, stabilizing selection
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
...
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
During the voyage of the HMS Beagle (1831–1836), the young Charles Darwin
collected several species of finches from the Galápagos Islands. Two of Darwin’s
finches are shown below.
Which species do you think is best adapted to a diet of small,
delicate seeds? Explain why you think so.
Geospiza fortis because it has a smaller, pointed beak
that can help pick up small, delicate seeds.
Which species do you think is best adapted to a diet of large,
tough-to-crack seeds? Explain.
The Geospiza magnirostris would probably be better
at eating large, tough-to-crack seeds because its beak
would help it crush the shells up more easily.
Gizmo Warm-up
Darwin’s finches are one of many types of animals on the
Galápagos Islands that have unique adaptations, or traits that
help an organism survive in its environment. The Rainfall and
Bird Beaks Gizmo allows you to explore how rainfall influences
the range of beak shapes found in a single finch species.
1. The beak depth of a finch is the distance from the top of the
beak to the bottom, as shown.
A. What is the current average beak depth in the Gizmo? 10.16 mm
B. Select the HISTOGRAM tab. Do all the finches have the same beak depth? No,
most are different.
2. Click Play ( ) and let the simulation play for five years with average rainfall (25
cm/yr). Select the GRAPH tab and view the Finches vs time and Beak depth vs
time graphs.
A. How does the finch population change? The population has some
variation and change because it goes up in numbers then it goes
down slightly again and climbs back up again with a decline
following.
This study source was downloaded by 100000835361505 from CourseHero.com on 02-02-2022 15:38:43 GMT -06:00
, B. Does the beak depth change significantly?
No, the depth of the beaks decreases over time, but nothing dramatic.
Over the timespan of 5 years, the beak of the finches went from 10.21-
10.05.
This study source was downloaded by 100000835361505 from CourseHero.com on 02-02-2022 15:38:43 GMT -06:00
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