Download 1. Different finch species have beaks of different

Beak of the Finch
As you watch the video, the quiz questions will appear. As you answer them, record your answers
below. Be sure to mark your answers if you need more than one try to get the correct answer.
This is the link to the video:
http://www.hhmi.org/biointeractive/beak-finch-film-quiz
1. Different finch species have beaks of different shapes and sizes. What do
these beak differences tell us?
A. Differences in beak shapes tell us that all the finches eat the same type of food.
B. Different finch beak shapes are evidence that all Galápagos finches shared a
common ancestor a long time ago.
C. Different finch beak shapes are evidence that over time, finch species adapted to
different food sources on the islands.
D. Different finch beak shapes are evidence that several finch species with different
beak shapes came to the Galápagos Islands from the mainland.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?
2. Genetic evidence supports which of the following explanations for the
presence of 13 different finch species on the Galápagos islands?
A. Each of the 13 species was founded by the independent migration of a different
species from the mainland to the islands.
B. Many years ago, more than 13 different species of birds migrated to the islands.
The current 13 finch species are the only species that survived.
C. It's not clear based on the DNA evidence whether the 13 species arose from a
single migration of one species or multiple migrations of several species from the
mainland to the islands.
D. Many years ago, a small population of a single finch species migrated to the islands
and evolved into the current 13 species.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?
3. In 1977, Daphne Major experienced a severe drought. The figure shows the
beak depths of the initial population of medium ground finches before the
drought (red bars), and of the drought survivors (black bars). What do the data
show? Select all that apply.
A. The most common beak depth of the initial population (red bars) was 8.8 mm. A
very small proportion of individuals with this beak depth survived the drought.
B. More than half of the initial finch population died during the drought.
C. The most common beak depth of the surviving population (black bars) was 10.3
mm. Less than a quarter of individuals with this beak depth from the initial population
survived the drought.
D. Finches with larger beaks had a survival advantage in the 1977 drought.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?
4. The top figure shows the beak depths of the 1976 finch population (red bars),
before the drought, and the population after the drought (black bars). The lower
figure shows the beak depths of the offspring of the drought survivors in 1978.
What do these figures tell us?
A. The average beak depth of the 1978 offspring population is larger than that of the
original 1976 population.
B. The finches that survived the drought (black bars in first graph) had offspring (red
bars in second graph) with on average much larger beaks than their parents.
C. The offspring (red bars in second graph) had a smaller range of beak depths—from
smallest to largest—than their parents (black bars).
D. The size of the offspring population in 1978 is much larger than the initial 1976
population, before the drought.
5. The Grants witnessed strong selection during the droughts in 1977 and 1985.
Compare the two droughts. Select all that apply.
A. In both droughts, larger-beaked medium ground finches had the highest survival
rates.
B. Both droughts resulted in strong natural selection on medium ground finch
populations.
C. Both droughts resulted in changes to available food , which favored the survival of
some medium ground finches over others.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?
6. How did the Grants test their hypothesis that differences in the finch songs
can keep different species of finches from breeding with one another?
A. They observed which birds were mating with one another and listened to the songs
the birds were singing.
B. They recorded birds singing on the island of Daphne Major to see which type of
song was sung more often by each species.
C. They placed stuffed females of different finch species on branches to see which
males would respond.
D. They played the songs of medium ground finches and cactus finches through a
loudspeaker to see which species responded to each song.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?
7. The film defines species as populations whose members don't interbreed.
What keeps different Galapagos finch species from mating? Select all that apply.
A. Individuals only recognize and respond to songs of their own species.
B. One population eats mostly small, soft seeds and the other population eats mostly
large, hard seeds.
C. Geographic isolation and different environments led to changes in traits that
affected mating.
1st answer: A B C D
Right or Wrong?
2nd answer: A B C D
Right or Wrong?
3rd answer: A B C D
Right or Wrong?
4th answer: A B C D
Right or Wrong?