Body Size Is a Heritable Trait in the Amphipod, an Aquatic

question 66

Multiple Choice

Body size is a heritable trait in the amphipod, an aquatic crustacean. Fish preferentially consume large amphipods, leaving primarily small amphipods to breed. Based on these observations, how would we expect evolution to affect ponds with and without fish?

• A) Ponds with fish should have larger amphipods.
• B) Ponds with fish should have smaller amphipods.
• C) Amphipod body size should not differ between ponds with and without fish.
• D) Ponds with fish should have amphipods that are either very large or very small.