Answer Happy

QUESTION 26 Some bacteria excrete siderophores that help with uptake of iron from the surrounding environment. A "cheater" genotype does not produce siderophores, but takes advantage of their production by individuals with the "cooperative "genotype. Experiments with these bacteria have shown that a population in the laboratory can become fixed for the cooperator genotype under which conditions? O High relatedness of individuals and weak competition. O High relatedness of individuals and strong competition. O Low relatedness of individuals and strong competition O Low relatedness of individuals and weak competition. O When there is no iron in the environment. QUESTION 27 One of the consequences of melting of the Arctic ice cap is reduced habitat for species that depend on its presence. O True O False QUESTION 28 Phenotypic plasticity and developmental canalization that have evolved together result in O Antagonistic pleiotropy. O Increased levels of neofunctionalization or subfunctionalization. O Lower average levels of linkage disequilibrium.. O Increased sensitivity to environmental changes. O Invariability in some traits mediated by plasticity in other traits.