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Martin Erwig wrote:

Hi, guys —

  • If the soul enters the body at conception, what happens when the fertilized egg divides into two separate embryos (identical twins)?
  • Does the soul split as well, or is a new soul added to one of the twins?

In the latter case, the twin that gets the new soul effectively seems to have a change of souls.

  • Is that a problem?
  • Conversely, when two fertilized eggs are fused into a chimera, does that mean that one of the souls is released?
  • If so, where does it go?

Martin

  { When the fertilized egg divides into two embryos (i.e. identical twins) what happens to the soul? }

Mary Ann replied:

Martin —

When an embryonic human splits into two embryos, a new soul is created at the moment that the new individual exists as an individual capable of receiving a soul. Souls cannot split, as they are spiritual, i.e., perfectly simple. The twin whose own the new soul is, does not have a change of souls, for that twin did not exist before the embryonic human split into two embryos.

As for chimera, in zoology the result of the fusion of two embryos or an embryo on another germ cell, there are no true human chimeras, though there are persons who seem to contain parts of a resorbed twin.

Where there is no human organism, there is no soul. Parts of a human organism are not a human organism, and therefore the person with parts of a resorbed twin has one soul. The twin, if it was resorbed, died, and its soul went to God.

Mary Ann

Eric replied:

Hi, Martin —

The Church has not definitively ruled on these matters.

Reason would suggest, though, that when twinning occurs, a new soul is infused at the point where the lives separate, as my colleague Mary  Ann ably explained.

Eric

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