The question raised regarding ensoulment of the human zygote is indeed a critical question of the day. While it is true that the Magisterium has not committed itself on this issue to an affirmation of a philosophical nature, it constantly reaffirms the moral condemnation of any type of procured abortion. This teaching has not been changed and is unchangeable. And it will be reunited with the body at the final Resurrection. From a philosophical perspective, it is clear that the human zygote possesses potentiality and actuality.
Potency is always in reference to that which is in act or a state of actuality.
Potency does not exist without actuality which implies being. American Bioethics Advisory Commission A division of American Life League, Inc.