This chapter addresses convergence on much smaller scales—that is, in the very molecules that make up living animals and plants—and presents examples of the convergent evolution of identical nuclear DNA molecules and of identical mitochondrial DNA molecules. It also analyzes the convergent evolution of the complex geometries and chemical compositions of the huge protein molecules, and shows that proteins and enzymes converge in every possible way. The chapter generally suggests that convergent evolution occurs across the entire spectrum of molecules which make up life.
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