On the Bahamian Island of Andros, Mosquitofish Populations Live in Various

question 28

Multiple Choice

On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time.
When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences.
If one builds a canal linking a predator-rich pond to a predator-poor pond, then what type of selection should subsequently be most expected among the mosquitofish in the original predator-rich pond, and what type should be most expected among the mosquitofish in the formerly predator-poor pond?

• A) stabilizing selection; directional selection
• B) stabilizing selection; stabilizing selection
• C) less-intense directional selection; more-intense directional selection
• D) less-intense disruptive selection; more-intense disruptive selection

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