discoideum) occasionally aggregate into a colony. About 20 percent of the amoebae in the colony make up a stalk that supports a ball composed of the remainder of the amoebae. The stalk-forming individuals die without reproducing, whereas the amoebae
Individual amoebae (Dictyostelium discoideum) occasionally aggregate into a colony. About 20 percent of the amoebae in the colony make up a stalk that supports a ball composed of the remainder of the amoebae. The stalk-forming individuals die without reproducing, whereas the amoebae in the ball, or fruiting body, give rise to spores that can become new individuals after the spores are carried away from the colony by passing insects and the like. On occasion two genetically different strains of the amoeba cooperate in the formation of a stalked fruiting body. What evolutionary puzzle is posed by this observation? Use kin (indirect) selection theory to make a prediction about the genetic similarity of the strains that work together when forming a colony versus those that do not.
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