Question 15 Percent of Swallows 20 16 12 8 4 0 103 104 105 106 107 108 109 110 111 112 113 Cliff Swallow Wing Length (mm) 3 pts Percent of Swallows 12 8 4 0 103 104 105 106 107 108 109 110 111 112 113 Cliff Swallow Wing Length (mm) The bottom plot shows the data for the swallows that survived during the course of the study. Please compare with original data (top plot) in Wing Histogram question by looking closely at the x-, y-axis values, and the data. The data in this graph are consistent with: False Stabilizing Selection True Directional Selection False Sexual Selection
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The figure shows the wing length of cliff swallows that died as road kill and of the population at large. What do these data indicate about natural selection acting on wing length in cliff swallows? Select one: a. Wing length is under stabilizing selection b. Swallows with longer wings are experiencing purifying selection c. Swallows with shorter wings are experiencing disruptive selection d. Swallows with longer wings are experiencing balancing selection e. Wing length is under negative frequency dependent selection
Farhan A.
b. The following data are wing and tail lengths among birds of a particular species. Wing length (cm), X Tail length (cm), Y 10.4 7.4 10.8 7.6 11.1 7.9 10.2 7.2 10.3 7.4 10.2 7.1 10.7 7.4 10.5 7.2 10.8 7.8 11.2 7.7 10.6 7.8 11.4 8.3 (Hint : ∑X = 128.2, ∑X² =1371.32, ∑XY = 971.37, ∑Y = 90.8) i. Find correlation coefficient for the above data ii. Test the hypothesis that there is a correlation between Y and X in the birds population. [7 marks]
Sheryl E.
The figure shows the wing length of cliff swallows that died as road kill and of the population at large. What do these data indicate about natural selection acting on wing length in cliff swallows? Birds with shorter wings die as road kill more often than the population at large; therefore, natural selection will favor birds with longer wings. Increasing population size in swallows has resulted in an increased number of road kill. Birds with longer wings are more likely to die as road kill, so natural selection favors birds with shorter wings. The probability that a swallow will die as road kill is not affected by its wing length; thus, natural selection is not acting on wing length.
Leyna S.
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