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Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below. Natural selection on beak size in Galapagos finches 0.25- 0.20- 0.15- 0.10- 0.05- 10.0 10.2 10.4 10.6 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 13.4 13.6 13.8 Beak size (mm) Frequency before Frequency after Frequency

Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below. Natural selection on beak size in Galapagos finches 0.25- 0.20- 0.15- 0.10- 0.05- 10.0 10.2 10.4 10.6 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 13.4 13.6 13.8 Beak size (mm) Frequency before Frequency after Frequency

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below.

 

Beak size (mm) Frequency before selection Frequency after selection
10.010.0 0.000.00 0.000.00
10.210.2 0.000.00 0.000.00
10.410.4 0.020.02 0.000.00
10.610.6 0.040.04 0.000.00
10.810.8 0.080.08 0.000.00
11.011.0 0.160.16 0.000.00
11.211.2 0.200.20 0.000.00
11.411.4 0.200.20 0.000.00
11.611.6 0.160.16 0.020.02
11.811.8 0.080.08 0.040.04
12.012.0 0.040.04 0.080.08
12.212.2 0.020.02 0.160.16
12.412.4 0.000.00 0.200.20
12.612.6 0.000.00 0.200.20
12.812.8 0.000.00 0.160.16
13.013.0 0.000.00 0.080.08
13.213.2 0.000.00 0.040.04
13.413.4 0.000.00 0.020.02
13.613.6 0.000.00 0.000.00
13.813.8 0.000.00 0.000.00

 

How much has the mean beak size changed due to selection? Give your answer to one decimal place. Units are mm.

Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below. Natural selection on beak size in Galapagos finches 0.25- 0.20- 0.15- 0.10- 0.05- 10.0 10.2 10.4 10.6 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 13.4 13.6 13.8 Beak size (mm) Frequency before Frequency after Frequency
Transcribed Image Text:Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below. Natural selection on beak size in Galapagos finches 0.25- 0.20- 0.15- 0.10- 0.05- 10.0 10.2 10.4 10.6 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 13.4 13.6 13.8 Beak size (mm) Frequency before Frequency after Frequency
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