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Bird Beak Lab
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by Nicole Simmons
| 22 Questions
Note from the author:
To better understand Natural Selection and Darwin's Finches
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1
1 pt
Enter the number of seeds collected for the small beak in test 1:
2
1 pt
Enter the number of seeds collected for the small beak in test 2:
3
1 pt
TOTAL number of seeds collected from the small beak:
4
1 pt
Enter the number of seeds collected for the big beak in test 1:
5
1 pt
Enter the number of seeds collected for the big beak in test 2:
6
1 pt
TOTA number of seeds collected for the BIG Beak:
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7
1 pt
Drought Year: Enter the number of seeds collected for the small beak in test 1:
8
1 pt
Drought Year: Enter the number of seeds collected for the small beak in test 2:
9
1 pt
TOTAL number of seeds collected from the small beak:
10
1 pt
Drought Year: Enter the number of seeds collected for the big beak in test 1:
11
1 pt
Drought Year: Enter the number of seeds collected for the small beak in test 2:
12
1 pt
TOTAL number of seeds collected from the small beak:
13
Which beak gathered the most seeds during the normal year?
Small Beak
Large Beak
Both
Not enough information to determine this
14
1 pt
Which beak gathered the most seeds during the drought year?
Small Beak
Large Beak
Both were equal
Not enough information to determine this
15
1 pt
Natural selection occurs when the environment favors or selects some traits over others. You have tested two variations of beaks, large and small. In the drought environment, which beak is the most favorable trait? Why?
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16
1 pt
During what year was the small-seed count the lowest?
1976
1977
1978
17
1 pt
During what year was the small beak finch population the lowest?
1976
1977
1978
18
1 pt
What happened to both finch populations when the seed supply shrank to its lowest amount? Why?
The Large Finch population decreased because there was not enough water available to sustain life.
Both of the populations decreased because there was not enough food for either type of finches.
The Small Finch population decreased because the genetic mutations within the small finch DNA was not present, as seed in the data.
Both of the populations increased because there was an abundance of food available for both types of finches.
19
1 pt
After the drought, only one in seven finches survived. When the survivors were measured, it was found that most were finches with big beaks. Why do you think bigger beaked birds survived better than the smaller beaked birds?
Because the big-beaked finches were larger and could stand up to predators more effectively than the small-beaked finches.
Because the big-beaked finches could eat only the small seeds and not the big seeds. The small-beaked finches could only eat the big seeds. The small seeds are what sustained life for the big-beaked finches
Because the big-beaked finches could eat both the small seeds and big seeds. The small-beaked finches could only eat the small seeds. There was not enough food for all of them to survive.
There is not enough information to answer this question.
20
1 pt
Beak size is a variation that is passed from parent to offspring. When the new generation of young finches was measured in 1978, there were many more young birds with larger beaks. What happened?
They all underwent a random genetic mutation that left them with large beaks
The large beaked finches were the best survivors and they passed the large beak trait to the next generation.
the small beak finches regressed in their evolution which left the large beak finches to evolve even further than they had
The large beaked finches were not able to survive on their own so they had to reproduce with the small beaked finches which resulted in an equal mixture of large and small beaked birds
21
1 pt
How does this support the conditions for natural selection?
For natural selection to occur, there must be variation and in this case, the variation was the size of the beaks. There must be a difference in fitness. The large beak trait allowed the finches to eat both sizes of seeds. The trait was passed from parent to offspring.
For natural selection to occur, there must be a single trait that remains the same, and in this case the that singular trait was wing size. There must be a difference in fitness. The large wing trait allowed the finches to eat both sizes of seeds. The trait was passed from parent to offspring.
For natural selection to occur, there must be variation and in this case, the variation was the seed type. There must be a difference in fitness. The large seeds allowed the finches to have the beak they needed. The trait was passed from parent to offspring.
For natural selection to occur, there must be variation and in this case, the variation was the amount of time the finches were observed. There must be a difference in fitness. The time-span allowed the finches to eat both sizes of seeds. The trait was passed from parent to offspring because of the number of years the study lasted.
22
1 pt
Natural selection leads to the predominance of certain traits in a population and the suppression of others. What trait became predominant (the stronger/better trait) and what trait was suppressed (weaker trait) on the island of Daphne?
Both beak sizes are supressed.
Both beak sizes are predominant.
The small beak was predominant and the large beak was suppressed.
The large beak was predominant and the small beak was suppressed.
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