Use the following information when answering the corresponding questions).
Martin Wikelski and L. Michael Romero Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376- 86) measured the snout- to- vent anus) length of Galápagos marine iguanas and observed the percent survival of different- sized animals. Figure 23.2 shows the log snout- vent length SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females.
Figure 23.2
-Examine the figure above. What type of selection for body size appears to be occurring in these marine iguanas?
A) stabilizing selection
B) directional selection
C) sexual selection
D) disruptive selection

Question

Use the following information when answering the corresponding questions).
Martin Wikelski and L. Michael Romero Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376- 86) measured the snout- to- vent anus) length of Galápagos marine iguanas and observed the percent survival of different- sized animals. Figure 23.2 shows the log snout- vent length SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females.
  Figure 23.2
-Examine the figure above. What type of selection for body size appears to be occurring in these marine iguanas?
A) stabilizing selection 
B) directional selection 
C) sexual selection 
D) disruptive selection

Quizplus · Accepted Answer

Stabilizing selection is indicated when the population mean stabilizes on a particular non-extreme trait value, often reducing variation around that mean, which seems to be the case based on the description of the selection for body size in marine iguanas.

Use the Following Information When Answering the Corresponding Questions)