Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish?
A) directional selection
B) stabilizing selection
C) disruptive selection
D) sexual selection
Answer: C
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What will be an ideal response?
The mesophyll of the leaf has which of the following characteristics?
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a. Charles Darwin b. Carolus Linnaeus c. Aristotle
d. Alexander von Humboldt e. Ernst Mayer