BIO-2023-CG3-172

Which one of the following symbols represents mating between relatives in human pedigree analysis? (figure-dependent: pedigree chart symbols — symbol A: three unrelated shaded shapes square circle diamond; symbol B: unshaded square linked by a single horizontal line to unshaded circle; symbol C: unshaded square linked by a DOUBLE horizontal line to unshaded circle, the consanguineous mating symbol; symbol D: a mating pair connected to a shaded affected offspring square below — not transcribable as text)