Acceptable bio-ethic-science today assures us that there is "until only between the 12th to 14th week of gestation adequate substantive  matter present to sustain a human personality". Before this time the life that is present is biological but not human.  [“agere sequitur esse” (“actions depend upon what one is”) or (“being something” makes capable “that kind of action”) is an axiom of philosophy].  That means that: Although many bishops (e.g. the USA Catholic Bishops’ Conference) "favor" a vision of "personhood" (i.e.  human persons beginning from the moment of conception);   nevetheless science, common sense and "sound Catholic morality" do NOT consider possible the existence of a human life from the moment of conception;


Nor does the  DNA in the zygote  make it “a human being” just as  acorns,  even though having the DNA for it, are still not oak trees, and just as rooster-fertilized eggs, even though having the DNA for it, are still not “chickens”.