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Science states that the mother contributes an X chromosome, while the father contributes either an X or a Y chromosome. If the father contributes a Y chromosome, the fetus will develop into a male (excluding anomalies); if the father contributes an X chromosome, the fetus will develop into a female (excluding anomalies).

According to Wikipedia’s entry on “XY sex-determination system,” it states,

In humans and many other species of animals, the father determines the sex of the child. In the XY sex-determination sys[tem, the father contr]ibutes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.

Since the Lord Jesus Christ had no human biological father, how is the determination of his male gender explained by Catholic apologists?

Edit: If you watch this YouTube video, @2:57, you will see that Tim Staples (from Catholic Answers) offers some speculation on the subject, but does not go any further. I am curious if there are some Catholic apologists who have actually discussed the matter in depth.

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The Catholic Church has no official position on this, since it is of minor importance (albeit an interesting problem).

The consensus of theologians who have studied the problem (Catholic and non-Catholic, who hold the Church’s firm belief in the Virgin Birth and the maleness of Jesus) is that, presumably, the genetic material for Jesus’s paternal complement of DNA was created miraculously.

This is likely to be the case, because the result of a parthenogenesis (viable parthenogenesis is extremely rare, if not nonexistent, in humans) would be a woman, not a man.

Moreover, it is unlikely that any of Mary’s DNA was simply “duplicated” in order to fill out any part Jesus’ paternal complement: generally, when maternal DNA is accidentally duplicated (even when there are no “extra” chromosomes), there are grave birth defects due to a phenomenon called genomic imprinting.

The fact that the Son was conceived as a healthy man would, therefore, be further confirmation of the miraculousness of Jesus’ conception and birth.

(For a decent overview of various positions, see http://archive.sltrib.com/story.php?ref=/lifestyle/ci_3207769. Note that the article represents a diversity of opinions, some of which are not compatible with orthodox belief in the Virgin Birth. Among those cited in the article, David Wilcox and Ronald Cole-Turner uphold the Virgin Birth; Wesley Wildman does not.1)

Some apologists, such as Tim Staples, mentioned by the O.P., would argue that all of the genetic material came from Mary (presumably with some kind of miraculous transformation that would account for the maleness and lack of problems caused by genomic imprinting, although he does not address this issue in the video).

1 Also, the article misrepresents the reason for the dogma of the Immaculate Conception: it has nothing to do with the supposed evilness of male seed—after all, Mary herself was conceived by a normal sexual act—but stems from the belief that Mary, in view of her divine motherhood, is all holy (panagia), and hence is exempt even from the effects of Original Sin.

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  • Theologically, this is a good answer, but still out of scope IMHO. Apart from the first sentence, this answer appears to be an opinion, or Truth.
    – Dick Harfield
    Jan 5, 2017 at 8:14
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    Fair enough, but there is not much else to say. Let me see if any theologians have actually dealt with the issue...
    – AthanasiusOfAlex
    Jan 5, 2017 at 8:17
  • I recommend deleting everything after the first sentence. In spite of its brevity, it could then be a good answer.
    – Dick Harfield
    Jan 5, 2017 at 8:19
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    Had Jesus been a woman , someone might put a similar question i.e.who contributed the second X chromosome ?
    – Kadalikatt Joseph Sibichan
    Jan 5, 2017 at 15:41
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    He got his Y chromosome the same way that Adam did - fiat creation.
    – Paul Chernoch
    Jan 5, 2017 at 18:02

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