[Ads-l] that:who::whom:which?

[Joel Berson]

While looking in the OED for anything under "clone", n., that might relate to Wilson's question, I noticed sense 1.c.  "An animal or (theoretically) a person that is developed asexually from its parent to whom it is genetically identical."

If one has used "that" in the first clause rather than "who" (because cloned persons are only theoretical?), then instead of "whom" in the second clause shouldn't one use "which"?

Joel

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