Tag Archives: DNA

The Divine Anatomy of the Human Body

This week we conclude the fourth book of the Torah (Bamidbar) with the double parasha of Matot and Massei. The latter lists the 42 stops that the Israelites made during the course of their forty year sojourn in the Wilderness. While we know that this forty year period was a “punishment” because the Israelites failed to enter and settle the Holy Land as commanded, there are deeper reasons as well. One of these is that the Israelites spent those four decades learning the Torah for the first time. In some ways, it was like their gestation period.

The Sages compared the 40 years in the Wilderness to the 40 weeks of pregnancy, and pointed out that the gematria of Bamidbar (במדבר) is 248, equal to rechem (רחם), “womb”. This number is not random, for the Sages enumerated precisely 248 parts of the body, which first develop in the womb. The number agrees with modern science, the human body having 206 bones and about 42 major organs (though the latter number is subject to some controversy, depending on how one defines “organ”). The 42 stops that the Israelites made in the Wilderness neatly parallel the 42 organs. The number 206, meanwhile, is the gematria of davar (דבר), literally “word” or “thing”, and is the root of Bamidbar, “In the Wilderness”. The Wilderness was where Israel first heard the Word of God, and where Israel was officially born as a people.

So, there was something of a “divine anatomy” to the time and place of the Israelite wandering. In a similar—and far more amazing—way, there is a “divine anatomy” to the human body.

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Why is Judaism Matrilineal?

In this week’s parasha, Va’etchanan, God cautions His people about intermarriage (Deuteronomy 7:3-4). Although the Torah is speaking specifically about intermarrying with the Canaanite nations, the verses have always been understood as prohibiting intermarriage with any and all other nations. This is especially true because the Torah goes on to say that intermarrying will lead to the children being led astray and being turned to idolatrous ways. In those days, the Canaanites were not the only idolaters, of course—just about everyone was an idol-worshipper—so all intermarriage was forbidden. The Torah phrases the prohibition in an interesting way:

You shall not intermarry with them; you shall not give your daughter to his son, and you shall not take his daughter for your son, for they will turn away your son from following Me, and they will worship the gods of others…

While the Torah makes it clear that one must not marry their son to a gentile woman, or their daughter to a gentile man, it goes on to only mention that the son will be turned away from God, not the daughter. (The same is true in Exodus 34:16, “And you will take their daughters for your sons… and they will make your sons go astray after their gods.”) The Sages explain that women tend to be of greater faith than me, and as the primary builders of the home, it is the women who set the spiritual tone of the family. A faithful Jewish man who marries a non-Jewish woman will, sooner or later, be led astray. Such was the case with a great many Jewish men following the Babylonian Exile, and when they finally returned to Israel, they admitted (Ezra 10:2-3):

We have broken faith with our God, and have married foreign women of the peoples of the land; yet now there is hope for Israel concerning this thing. Now therefore let us make a covenant with our God to put away all the wives, and such as are born of them, according to the counsel of Hashem, and of those that tremble at the commandment of our God; and let it be done according to the law.

“Ezra reading the Law in the hearing of the people” by Gustave Doré

From all of the above, the Sages conclude that Judaism passes on maternally. Scripture makes it clear that only the non-Jewish mother will turn a Jewish man astray, and as we learn from Ezra, only those born to “foreign women” are not part of the Covenant. Aside from this, there are a number of other practical and spiritual reasons why Judaism must be matrilineal.

Since the mother is the one actually giving birth to the child, it is pretty much clear every single time who the child’s mother is. The same cannot be said of the father. Throughout history, when raping and pillaging was unfortunately very common, and there were no paternity tests, only the mother’s status as parent was evident. This may be why the ancient Greeks and Romans tended to be matrilineal as well.

Shaye J.D. Cohen points out (see chapter 9 of The Beginnings of Jewishness) that in Athens, only the offspring of an Athenian man and an Athenian woman could have Athenian citizenship, a law introduced by Pericles around 451 BCE. If an Athenian man married a foreign woman, the children would not be Athenians. Later, the Romans similarly held that only two Roman citizens can have a child who was a Roman citizen, and if a Roman married a foreigner or someone of a lower social class, the status or identity of the child would be that of the mother.

While these rules make sense from a logical perspective, they also recognize the profound connection that a child and mother have—far superior to that of child and father. And this ties into the deeper biological, and spiritual, reasons for why Judaism is matrilineal.

The Genetics of Motherhood

When it comes to the genes and traits of children, people tend to think that they are a 50-50 mix of mother and father. We learn in school how 23 chromosomes from the father (carried by sperm cells) meet 23 chromosomes from the mother (in the egg cell) to produce a new child. We are made to believe that even if the child may look more like one parent, they are nonetheless perfectly half-half. This is completely untrue.

A karyotype showing 23 pairs of chromosomes. (Credit: National Human Genome Research Institute)

First of all, when it comes to boys, the Y chromosome of the father is far smaller and carries significantly less genes than the mother’s X chromosome. Girls do have half of their father’s and half of their mother’s genes (receiving an X from each, along with the other 22 chromosomes). However, this only refers to nuclear DNA. The cell has other forms of heritable genetic material, too, most notably in mitochondria.

The mitochondrion is one of the most vital components of any cell, and provides the bulk of a cell’s energy. The main reason that you breathe is to provide oxygen for mitochondria. They are involved in countless processes, including calcium storage, cell signalling and communication, metabolism, hormone production, the breakdown of wastes (such as toxic ammonia in the liver), and apoptosis, or cellular death. A single cell could have over a thousand mitochondria.

Mitochondria under a microscope.

These mitochondria have their very own DNA, carrying hundreds of additional genes. This DNA, called mtDNA, is passed down strictly from mother to child. A father’s mitochondria play no role. In fact, because of this, geneticists are able to trace a person’s maternal lineage fairly accurately thousands of years into the past by analyzing mtDNA. (My own mtDNA—haplogroup U6a—dates back to a woman who lived in North Africa about 1000 generations ago!)

There are multiple other cellular components that are passed down almost entirely from mother to child. Because the sperm essentially donates only its nucleus (with its chromosomes) to the egg, it is the egg cell itself that begins to divide in producing an embryo. Thus, the bulk of a person’s cellular structure comes from their mother, too. Back in university, I had one biology professor who estimated that inheritance is not 50-50, but more like 80-20. From a scientific perspective, we are far, far more like our mothers.

This is one reason why mothers have such a deep and profound connection to their child. Amazingly, scientists have recently discovered that when a woman is pregnant, DNA (and whole cells) from the child actually goes into the bloodstream and ends up in the mother’s brain! Fetal cells have also been found in lungs, muscles, and heart tissue of mothers. A mother will literally carry the DNA of her children in her body for the rest of her life.

Just as children are physically more connected with their mothers so, too, are they more spiritually connected to their mothers. (After all, one of Judaism’s central principles is that the dynamics of this physical world are only a reflection of the spiritual realms.) And this is yet another key reason why Judaism is, and must be, matrilineal.

What About Conversion?

The genetics perspective brings up an important question: what about converts? A person who converts to Judaism is, of course, a full-fledged Jew. But their DNA hasn’t changed! It goes without saying that Judaism is not genetic, and the discussion of genetics above is meant to only be an analogy for spiritual processes.

Having said that, we have an opportunity here to bust another common myth: that a person’s DNA is unchanging. People are often taught that whatever DNA they are born with, they are stuck with. If they have a defective gene for a particular condition, then they will definitely develop that condition. Today we know that this, too, is not entirely correct.

As discussed before in detail, our body has epigenetic machinery which allows gene expression to be controlled. Just because a person has a certain gene does not mean that the gene will be operational. It can certainly be “shut off”. While it was once thought that our lifestyle choices have no impact on our genes or epigenetics, new research continues to show that the choices we make have a tremendous effect on our genes. We’ve known for a long time that things like diet and physical activity impact gene expression, and now we even have evidence that prayer and meditation affects our genes.

Therefore, a person who sincerely converts to Judaism, and begins to live a Jewish lifestyle, eat like a Jew, think like a Jew, and pray like a Jew, will very likely experience changes on the genetic (or epigenetic) level as well. And these epigenetic changes are hereditary.

This is yet another reason why it is so important to convert to Judaism properly. Converting means not only converting in name, but becoming Torah-observant and living a Jewish life. Otherwise, what’s the point of the conversion? This is precisely why Orthodox conversions tends to be so difficult and time-consuming. The rabbis want to ensure (as much as possible) that the person is serious about becoming a Jew, and will actually live as one.

The process is far from perfect, and sometimes they do make it too difficult and tedious. We have addressed this in the past as well. Some point out that it was never so difficult to convert in past centuries. This is true, as the Talmud (Yevamot 47b) explains the procedure thus:

Once healed [from circumcision], we immerse him immediately; and two scholars stand above him, and teach him a few easy commandments and a few difficult commandments. Once he has immersed and come up from immersion, he is part of Israel for all matters. If the convert is a woman, women sit her in the water up to her neck and two scholars stand outside, and teach her a few easy commandments and a few difficult commandments.

That’s all it took back in those days. A person was just taught a few introductory mitzvot while already immersed part way in a mikveh. They would pick up the rest when going on to live as Jews and marry into Jewish families. Even in the time of the Rambam (Rabbi Moshe ben Maimon, 1135-1204) hundreds of years later, he codifies this exact procedure as law (Mishneh Torah, Issurei Biah 14:6). Yet, in those days just about everyone was religious (whether Jewish or not). This isn’t the case in today’s secular society. A person who converts to Judaism wouldn’t necessarily learn how to be a Jew by simply marrying into a Jewish family. It is necessary to carefully teach them everything beforehand.

It is just as necessary to determine their real intentions, and affirm their absolute sincerity. In a world where people change their identities faster than they change their socks, it isn’t surprising that Orthodox rabbis take conversion very seriously and are extremely stringent about it. It is important to keep this in mind as we continue to hear about intermarriage and the “who is a Jew?” debate in the mainstream media.

A Mystical Look at Pregnancy and Abortion

This week’s parasha, Tazria, begins by stating that a woman who gives birth to a son is spiritually impure for seven days, and requires another 33 days of purification afterwards. If she gives birth to a female, the impurity lasts fourteen days, followed by 66 days of purification.

The Zohar (III, 43b) comments on this section by first reminding us that each soul has male and female halves, and when the soul enters this world, it splits and enters two different bodies, male and female. If the two soulmates merit it, they will find each other and reunite. We are then told that the female part of the soul is larger and more powerful, which is why a woman who gives birth to a female needs double the purification time.

The Zohar explains why the Torah prescribes these specific time periods: 7 and 33 days for boys; 14 and 66 days for girls. It states that at birth, the soul first enters the body and is in complete disarray. For the first seven days, the unsettled soul “roams the body to find its place”. On the eighth day, the soul is finally getting comfortable in its new home. This is one reason why circumcision is done on the eighth day, once the soul is no longer distressed. The soul then needs an additional 33 days to acclimatize to its new environment until it has completely settled into the body. For the greater female souls, the time periods are doubled.

Note how these time periods are referring to the soul of the newborn, yet it is the mother that is described as being “impure”. This is because the mother carried the child, and its soul was housed within her temporarily. (Perhaps this extra soul is responsible for the well-known “pregnancy glow”.) Once the baby is born, its soul leaves the mother’s shelter and is now independent in the baby’s body. (And that pregnancy glow is gone!) The sudden loss of spiritual energy is difficult on the mother as well, and she requires forty (or eighty) days to get back to herself.

A major question arises here: if the soul only enters the newborn at birth, why is abortion forbidden? Religious groups of various faiths have argued for centuries on when exactly the soul enters the body, and many have taken the stance that a fetus already carries a soul, making abortion indistinguishable from murder. What do Jewish texts say?

Abortion and Gestation in the Talmud

In one passage, the Talmud includes abortion under the category of murder. However, it also famously states that if the mother’s life is at risk—at any point in the pregnancy—the fetus must be removed, “limb by limb” if necessary. In such cases, the fetus is seen as a rodef, a “pursuer”, referring to the Torah law that if one is “pursuing” another to kill them, it is permitted to kill the pursuer first. The Talmud concludes that a fetus can be aborted at any point until its head has emerged. Once the head has emerged, the newborn is considered completely alive, and in cases of life-risk, it is no longer clear who the “pursuer” is. The Sages suggest that the soul fully enters the newborn only at birth, and it is only then that the newborn is a complete person.

Three-month old fetus (Courtesy: BabyCentre)

Elsewhere in the Talmud (Niddah 8b), we are told that the fetus already resembles a person at the three-month mark. We now know that it is precisely around this point that the developing baby has the features of a human (and is no longer called an “embryo”, but a “fetus”). The Talmud adds (Berakhot 60a) that until this three-month mark, a person should pray every day that there shouldn’t be a miscarriage. After three months, a person should pray that the fetus will not be stillborn, and after six months, a person should pray that the mother has an easy delivery. We are told that one should pray for the baby’s desired gender only before the 40-day mark. This, too, shows incredible wisdom on the part of our Sages. Today we know scientifically that the sex organs begin their development around day 42. The ancient rabbis knew that after day 40, gender development is already in progress, and there is no point praying for something different.

In a related passage, we are told that until day 40, the fetus is insignificant and more lifeless than living (Yevamot 69b). Today we know that the neural tube which will make the brain forms around day 40, and this is when the first neurons start signalling. Scientifically speaking, there could be no talk of any kind of consciousness or brain activity before day 40.

Because of this, most rabbinic authorities are far more lenient when it comes to abortions before the 40th day of pregnancy. Rabbi Chaim Ozer Grodzinski (1863-1940), who was widely recognized as the greatest posek of his generation, even suggested that abortions before the 40th day are not Biblically prohibited (Achiezer, III, 65:14). Nevertheless, even before the 40th day there is a potential to produce a living human being, and life is valued above all else, which is why abortions are still forbidden except for cases of absolute necessity.

By the 20-week mark (midway through pregnancy), fetuses are seen rolling around, sucking their thumbs, and responding to the prodding of the ultrasound. There is no doubt that the fetus is alive and aware at this point, and any abortion other than a life risk is hardly distinguishable from murder.

Soul Infusion

The fact that the fetus is aware by the 20-week mark (if not sooner) suggests that it does indeed have some level of soul. Yet, earlier we saw sources seemingly propose that the soul does not enter until birth. How do we reconcile these apparent contradictions?

To answer this question it is important to keep in mind that the soul is not one uniform entity. Rather, the soul is composed of multiple layers, each made up of countless sparks. The lowest level of soul is called nefesh, the basic life essence. Above that is the ruach, “spirit”, an animating force that, among other things, gives a person their drives and inclinations. Then comes the neshamah, a higher level of consciousness and the part that gives one their unique traits and qualities. Further still is the chayah, the aura that emanates from the body, followed by the loftiest level, the yechidah, which may be described as a spiritual umbilical cord between each soul and its Creator.

The Arizal taught that ever-higher levels of soul are accessed gradually over the course of one’s life. At birth, a person has only a complete nefesh. As they grow, they are infused with ruach, which becomes fully accessible at bar or bat mitzvah age. At this point one starts to tap into their neshamah, which is wholly available only at age 20. (For this reason, the Torah considers an adult one who is over 20 years of age. Only those over 20 were counted in the census and allowed to join the military. Our Sages state that although one may be judged for their crimes before age 20 here on Earth, only those sins accrued after age 20 are judged in Heaven. Meanwhile, the Midrash notes that Adam and Eve were created as 20 year olds.) The Arizal taught that most people never end up accessing their entire neshamah, and only the most refined individuals ever unlock their chayah and yechidah.

Based on this model, we see that right from conception the developing embryo is steadily infused with nefesh, the basic life force. By day 40, there is enough nefesh for the embryo to be considered alive. In fact, it is said that this is why the gematria of אם, “mother”, is 41, since a woman becomes a mother on the 41st day of pregnancy.

Once its entire nefesh has been infused, the baby is ready to be born. At birth, it begins to receive its next soul level, the ruach. A careful look at the Zohar passage with which we started reveals that this is precisely what the Zohar meant, as it explicitly mentions the ruach entering at birth, requiring forty days to fully settle in. Therefore, a developing fetus does indeed have a soul, which is why abortion is so highly discouraged—reserved only for true medical cases—and why it has been compared to murder.

Solving a Scientific Mystery

The above also answers a mystery that has been perplexing biologists for decades: what is it that drives an embryo to grow? Why do the cells multiply, and how do they know to differentiate? Each cell is exactly the same, with the exact same set of DNA, yet one clump of cells knows to form the eyes while another knows to form the liver, and so on. Scientists have still not been able to figure out how the embryo “knows” what to do. (For that matter, we can’t figure out how any cell really “knows” what to do.)

The Kabbalists have an answer: it is the steady infusion of soul that drives a mass of undifferentiated cells to do what it needs to. It is the soul that gives the instructions for how the DNA is to be transcribed and translated in each cell, and how the cells are to interact with one another. As the soul grows, so too does the body. It is therefore not surprising that around the age when most people’s bodies stop growing, their souls tend to stop “growing” as well.

This should remind us that our education does not end with formal schooling, nor does maturing stop with the end of puberty. The process of growth and refinement, both physical and spiritual, must continue throughout life. This is the key to true self-fulfillment and happiness.


The article above is an excerpt from Garments of Light. Click here to get the book.