Genetics and the Shahnameh

We have very archetypal ideas about genetics.

Reading a recent translation of the Persian Epic, the Shahnameh, I was impressed with two things, among all the formulaic focus on war and kingship. First was what it did not say, and second was its attitude, which is shared with all sorts of traditional societies, towards blood, nobility, and what we now understand as genetics. This epic, which transitions from wholly myth in the first half to quasi-history in the second, stops abruptly at the Arab conquest. Not a word is uttered past the overthrow of the last Persian pre-Islamic ruler. Not a word about Islam, not a word about the well over three hundred years of history of Persia under the Arab yoke by the time this was written circa 1000 AD. That says a lot about what the author, Abolqasem Ferdowsi, regarded as the significant boundaries of Persian history. Not that he was opposed to narrations of decline and suffering. The final era of the Sassanian Empire was one of chaos and decline, with regicides and civil war. But apparently, that history was still Persian, while the Arab epoch was something else entirely- something that Iran is still grappling with.

The epic is full of physical descriptions- kings are always tall as cypresses and brave as lions, women are always thin as cypresses, their faces like full moons and their hair musky. True kings radiate farr- glowing splendor that they show from a young age, which marks them as destined rulers. But farr can also be lost, if they turn to the dark side and loose popular support. The Chinese have a similar concept in the mandate of heaven, which, however, is not portrayed as a sort of physical charisma or halo. Children are generally assumed to take after their parents, for good or ill. The concept of the bad seed comes up in the Shahnameh, especially in the saga of Afrasyab, king of Turan and long-time antagonist of Persian kings and their champion, Rostam. Persian king Kavus has fathered a great (and handsome) champion, Sayavash. Through several plot twists, Sayavash must leave Persia and is adopted by Afrasyab, even marrying his daughter. But then the drama turns again and Afrasyab kills Sayavash. Thankfully, Sayavash had already fathered a future king of Persia, whom the Persians suspect of bad lineage, due to his descent from Afrasyab- a suspicion that they are slow to overcome.

"By the time the boy was seven years old, his lineage began to show. He fashioned a bow from a branch and strung it with gut; then he made a featherless arrow and went off to the plains to hunt. When we was ten he was a fierce fighter and confronted bears, wild boar, and wolves. ... Seeing the boy's noble stature, he dismounted and kissed his hand. Then he gazed at him, taking in the signs of kingly glory in his face."

Ancient peoples have generally taken nobility and bloodlines very seriously, for several reasons. First, obviously, is that children do take after their parents, for good and ill, just as ethnic groups similarly have some distinctive characteristics. Second is that, for practical as well as psychological reasons, people always seek good rulers and stable ruling systems, which in the aristocratic, patriarchial setting means an orderly transition from king to prince. The fairy tale (archetypal) ending is that the prince and princess take over the kingdom, and everyone lives happily ever after. Third, is that hierarchy of some sort seems to be part of our cultural DNA. Someone or group is always up, others down. Whatever the group or organization and whatever its professed principles, hierarchy re-asserts itself. Those on top want naturally to stay on top, and bequeath that position to their future replicas, i.e. their offspring. To do that they will generate all the practical advantages they can, and into the bargain foster a mythos of just distinction, based on their glorious bloodline, if not outright divine sanction from god. Thus genealogical trees, heraldry, etc.

The Shah is not like you or me...

The ruling houses of Europe over the whole post-Roman Era were infested with these archetypes and mythologies. Marrying "up" or "down" was a vast game carried out across the continent. And what has it gotten us? Prince Charles. It is obvious that something went awry in this genetic exercise of assortive mating, as it did ultimately in the tragedies of the Shahnameh as well. The behavior of royals generally fails to select for all the positive traits that are ultimately needed. Their training fails frequently as well to expose those good traits that do exist. But most of all, genetics is far more of a crapshoot than the archetypes allow. 

Children do take after their parents, but there are stringent and interesting limits. A child gets only half of each parent's genes, and those genes may be from either copy in each parent. That copy might have been totally silent- recessive vs the other dominant allele. Two brown-eyed parents can have a blue-eyed child, if they are heterozygous for eye color. Multiply this over thousands of loci, and the possibilities are endless. This is why traits of the grandparents sometimes are thought to come up unexpectedly, or novel traits entirely. The genetic mixing that takes place on the way to new life is carefully engineered to replicate, but with wide variation on the theme, such that any child is as much a child of its wider lineage and environment as of its particular parents. Genetic defects remix during this process as well, concentrating in some children, and leaving others fortunately free to realize greater potentials. The obsessive concentration of lineages that characterize royalty systems, such as was taken to an incestuous extreme in Egypt, leads to inbreeding, which means the exposure of defective alleles due to excessive homozygosity. We all have defective gene alleles, which are typically recessive, and thus get exposed only when they pair up with an equally defective partner. Thus an extreme focus on lineage and purity leads to its own destruction.

The differences between ethnicities are far less than those between families. Human lineages may have some strongly selected and differentiated traits, such as skin color, but such traits are exceedingly rare. Otherwise, our genetics are a cloud of variation that crosses all ethnic lines. Humans were a single lineage only a few hundred thousand years ago, or less, so broadly speaking, we are all the same. Indeed compared to most species, such as chimpanzees, we have much less genetic variation overall, and are virtually clones, due to the relatively recent bottlenecks of extremely low population that reduced genetic diversity. Our current population size relative to those of the other great apes certainly does not reflect conditions in the past!

Education was another ingredient in the traditional systems of nobility and aristocracy. Only the rich could afford an education, so only the upper crust were educated, thus gaining one more credential in addition to their genetic credentials, over the middle and lower classes. Such notions of aristocracy died perhaps hardest in military circles, where officers were long an aristocratic class, selected for their connections, not their ability. It was one of the great American innovations to establish a national military college to which admission was distributed liberally to deserving candidates, (at the same time as similar academy was set up in revolutionary France by Napoleon). It is obvious that the capacity for education was far more widespread than originally conceived, and we benefit today from the very active diffusion of education for everyone. Yet not all are college material. Some children are bright, some less so. Genetics and early development still count for a great deal- but good (and bad) genes can come up anywhere. That means that in the end, the American system of meritocracy, for all its defects, of which there are many, and despite its significantly unfulfilled promise to many, is a huge advance over the hidebound traditions, archetypes, and injustice, of aristocracy.

But back to genetics- what are we finally to make of genetics, eugenics, and noble bloodlines? It is clear that humans can be selectively bred, just like any other animal. Twins and twin studies make it abundantly clear that all sorts of traits- physical and mental- are gene-based and heritable, to striking extents. It is also clear that historical attempts at eugenics have not turned out well, whether through systems of nobility or more modern episodes of eugenics. The former were largely self-indulgent and self-serving ideologies designed to keep power and status among an elite, within which poor choices in mates and inbreeding consistently led to genetic doom. The latter were ideological exercises in frank racism, no more anchored in positive values, genetic or otherwise, than the aristocracies of yore. There have been occasional successful genetic experiments in human breeding, such as the Bach family, Yao Ming, and Stephen Curry, which show what can be done when one puts one's mind to it! (The Trump brood may also be cited as another, if negative, example.)

But generally, selective breeding implies a single set of values that constitute its goal. Our values, as a society, are, however, diverse in the extreme. We celebrate some people more than others at a political or social level, but have been heading in the direction, since our country's founding, of recognizing the dignity and worth of every person without exception, along with their freedom to form and express their own values. We can neither agree on a society-wide set of specific values that would shape any form of selective eugenics, nor allow individuals to go beyond the bounds of normal mate selection to plunge into cloning, genetic alterations, and the like, to inordinately expand their genetic influence on succeeding generations. All that would strike at the heart of the social project that is America- to foster individual opportunity and merit, while at the same time respecting the rights and worth of each individual- indeed, each way of life. It is likely that, given the technology, we might come to a general consensus to eradicate certain genetic diseases and syndromes. But beyond that lies a frontier of genetic engineering that the US is particularly poorly suited to cross, at least until we have made America great again, so to speak, and become another society entirely.

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• Followup quote from Frederick Douglass:

"Color prejudice is not the only prejudice against which a Republic like ours should guard. The spirit of caste is malignant and dangerous everywhere. There is the prejudice of the rich against the poor, the pride and prejudice of the idle dandy against the  hard-handed workingman. There is, worst of all, religious prejudice, a prejudice which has stained whole continents with blood. It is, in fact, a spirit infernal, against which every enlightened man should wage perpetual war."