Tossup

Otto Bütschli (“BEWTCH-lee”) hypothesized that the last common animal ancestor with this property was derived from a cnidarian (“nye-DARE-ee-un”) larval stage called a planula. Joseph Thornton’s team used ancestral protein reconstruction to determine that this property evolved due to a mutation in the spindle associated protein GK-PID. Herron et al. observed that an organism without this property quickly evolved it in response to predation by Paramecium. (10[1])Slime molds (10[1])like Dictyo·stelium (10[1])combat (-5[1])food scarcity by adopting this trait to grow fruiting bodies. (10[1])This (-5[1])trait’s presence in Volvox and absence in (10[1])Chlamydomonas (10[1])acts as a model for this trait’s (10[1])evolution in green algae. (10[1])The only fungal species that do (-5[1])not possess this property are yeasts, meaning (10[1])they cannot form differentiated tissues. (10[1]-5[1])For 10 points, name this trait (10[1])that (10[1])is contrasted with unicellularity. (10[5])■END■ (10[5])

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