Which are the third-order genes?

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The idea being tested is recognizing higher-order Rh haplotypes, where “third-order” genes are those more complex RHCE combinations that carry multiple antigen determinants on the same chromosome. In this context, the third-order gene examples are the haplotypes that pair a D-containing or D-lacking chromosome with the C and E determinants together. The correct choice shows RZ with DCE and ry with dCE, illustrating those higher-order, multi-determinant haplotypes. The other options either lack this paired, multi-determinant pattern or mix in combinations that don’t represent the third-order configuration.