In the United States certain Republicans have been proposing legislation that would define a zygote as a legal person. The most recent instance occurred in Mississippi when voters were given the chance to approve or reject the following: “the term ‘person’ or ‘persons’ shall include every human being from the moment of fertilization, cloning, or the functional equivalent thereof.” The voters rejected this, but there are other similar attempts planned or actually in the works. There are, as far as I know, no serious attempts to push person hood back before fertilization (that is, to establish eggs and sperm as being persons).
Since this is a matter of law, whether or not a zygote is a legal person or not depends on whether such a law is passed and then passes legal muster. Given that corporations are legally persons, it does not seem all that odd to have zygotes as legal people. Or whales. Or forests. There is, after all, no requirement that legal personhood be established by considered philosophical argumentation.
From a philosophical perspective, I would be inclined to stick with what seems to be the general view: zygotes are not persons. I do accept the obvious: a zygote is alive (as is an amoeba or any cell in my body), a zygote has full human DNA (as does almost any cell in my body), and a zygote has the potential to be an important part of a causal chain that leads to a human being (as does any cell in my body that could be used in cloning). However, these qualities of a zygote do not seem to be sufficient to establish it as a person. After all, the relevant qualities of the zygote seem to be duplicated by some of the cells in our bodies and it would be absurd to regard each of us as a collective of persons.
But, as I noted, the legal matter is quite distinct from the philosophical-after all, zygotes (or anything) could become legal persons with the appropriate legislation. This leads to a point well worth considering, namely the consequences of such a law.
The most obvious would be that abortion and certain forms of birth control (such as IUDs and the “morning after” pill) would certainly seem to be legally murder. After all, they would involve the intentional (and possibly pre-meditated) murder of a legal person. This is, of course, one of the main intended consequences of such attempts. However, there would seem to be other consequences as well.
One rather odd consequence would be in regards to occupancy laws and regulations. These tend to be set by the number of persons present and unless laws are written to allow exemptions for zygotes, etc. then this would be a point of legal concern. This seems absurd, which is, of course, the point.
Another potential consequence is the matter of deductions for dependents. If a zygote is a person, then a frozen zygote is still a person and presumably the child of the parent(s). This would, unless specific laws are written to prevent this, seem to allow people to claim frozen zygotes as dependent children and thus take a tax deduction for each one. While the cost of creating and freezing zygotes would be a factor, the tax deductions would seem to be well worth it. Perhaps this is the secret agenda behind such legislation: people could avoid taxes by having enough zygotes in the freezer.
Of course a “zygotes are people” law might also entail that it would be illegal to freeze zygotes on the grounds that they would be confined or imprisoned without consent or due process. Naturally, laws would need to be written for this and they would also need to be worded so as to avoid making “imprisoning” a zygote in the womb a crime. There is also the matter of in vitro fertilization and whether or not certain processes would thus be outlawed by the “zygotes are people” law. After all, some of the zygotes created do not survive. If these zygotes are people, IVF could be regarded as involving, if not murder, at least some sort homicide or zygoteslaughter. Of course, outlawing such practices seems to be one of the intended consequences of these proposed laws.
Another point of concern is the matter of death certificates. After all, the death of a person requires a certificate and the usual legal proceedings. If a zygote were to be a legal person, then it would seem to follow that if a zygote died, then the death would need to be properly recorded and perhaps investigated to determine if a crime were committed. Naturally, specific laws could be written regarding various circumstances (for example, should women have to report every zygote that fails to implant-thus resulting in the death of a person). Perhaps the state would need to set up womb cameras or some other detector to monitor the creation of these new people so as to ensure that no death of a person goes unreported.
One rather interesting consequence is that such a law might set the precedent that any cell that could be cloned would count as a person (after all, as argued above, it would seem to share the relevant qualities of a zygote and the law in question mentioned cloning or any functional equivalent). This would have some rather bizarre consequences.