The Twinning Challenge

Picture One of the challenges to the view that personhood begins at fertilization comes from the fact that twinning occurs after fertilization.  This challenge is usually presented in the following manner:

“You say that fertilized eggs should be defined as people, but how can a fertilized egg be a person if it can randomly split and become two or more people through twinning?  How can something be one unique person if it could also be two or more people?”

The solution to this challenge is to recognize that twinning is just a natural form of cloning…

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