On a Five-Generation Pedigree, Which Feature Distinguishes an X-Linked-Dominant Disorder

On a five-generation pedigree, which feature distinguishes an X-linked-dominant disorder in which males and females are equally affected from an autosomal-recessivepattern of inheritance?

A) The disorder is not apparent until adulthood.
B) Unaffected individuals do not have affected children.
C) There are no instances of an affected father transmitting the disorder to his son.
D) Unaffected parents (who do not express the disorder) do have affected children.

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