In recent years, a new—yet old—ideology has begun to take root in corners of the political and theological Right. Often called "Racial Realism," it argues that humanity is not just a collection of cultures, but a series of fixed, biological "kinds" intended to remain separate.

Proponents of this view often point to the biblical account of Noah’s sons—Shem, Ham, and Japheth—as the divine blueprint for this separation. They argue that these three men founded three distinct, "pure" lineages that define our ethnic boundaries today.

But does this theory hold up? If we take the biblical account of the Flood as our historical starting point, what would the scientific consequences actually be? By treating the "Three Sons of Noah" as a testable scientific model—what population genetics calls a "population bottleneck"—we can use the tools of modern genetics to see if "pure families" are even possible.

The Shared Starting Point

To build this refutation, we proceed from a foundational, shared starting point: the historical reality of a worldwide flood and the repopulation of the earth through the three sons of Noah—Shem, Ham, and Japheth. We accept these men as the real, historical founders of all human populations today.

Racial Realism and its theological variants argue from this same starting point that these three family lines were intended to remain separate and "pure," and that today's ethnic groups are the direct, distinct, biological result of this ancient separation.

The Belief in "Separate Kinds"

At the core of this belief system is the idea that God ordained humanity to exist in separate, distinct "kinds." Proponents see the story of Noah's sons and the subsequent Tower of Babel event as key moments where God established this order.

The Table of Nations (Genesis 10): This chapter lists the descendants of Shem, Ham, and Japheth, describing how they spread out "by their clans and languages, in their territories and nations."[1]

The Theological Claim: Some view this as God's positive and deliberate act of creating separate, genetically distinct groups intended to remain apart. They see this separation as a part of the created order, similar to the separation of animal kinds.

Note: This comparison fails at the biological level. While different animal "kinds" (species) are often genetically barred from interbreeding, the "One Created Kind" of humanity is defined by its ability and historical tendency to intermix across every geographic boundary. In humans, there are no biological walls—only temporary geographic distances.

The "Marble Bottle" Problem

In science, this restart idea is called a "population bottleneck."[2] A bottleneck is when a population gets "squeezed" down to a very small number, perhaps because of a disaster like a flood or a famine.[3]

You can think of it like this: Imagine all the "pre-Flood" people are a giant jar full of thousands of marbles of every color. Each color is a different gene (a piece of your DNA code). Now, imagine the Flood tips over that jar, and only eight marbles roll out (Noah's family). By pure chance, maybe you only get red, blue, and yellow marbles. All the other colors—green, purple, orange—are gone forever. They are lost from the human "gene pool" forever.[4]

This tiny group of "founders" (the eight marbles) now has to create the entire new population. This is called a "founder effect."[5] The small number of genes they have will have a huge impact on what all future humans look like.[6]

The Problem of "Pure" Families

The "three pure families" idea says that Shem's descendants, Ham's descendants, and Japheth's descendants split up and stayed separate forever. But if they did, the bottleneck would cause another problem. When you have a tiny group of people, they have to have children with people they are related to (inbreeding). This actually makes less diversity, not more.[7]

So, how do we get the wonderful, rich variety of people we see today—all the different heights, hair colors, and other features—from such a simple starting point? The "pure families" idea says they did it by staying separate. But science shows this is the opposite of what would need to happen to get the diversity we have today.[8] You would need lots of new gene variations to appear, and you would need people to mix to spread them around.

Why "Families" Can't Stay the Same

Let's imagine our three families start to spread out across the Earth. Two powerful forces in science make it impossible for them to remain "pure" or unchanged.

Force 1: Genetic Drift (The "Random Chance" Engine) Genetic drift is just a fancy term for random chance.[9][10] Imagine Japheth's family splits into two tribes.

In Tribe A, just by random luck, more people are born with blue eyes.

In Tribe B, just by random luck, more people are born with brown eyes.

After a few generations, these two tribes already look different from each other, even though they came from the same family.[11] Genetic drift means that "Shem's family" wouldn't be one family; it would quickly become thousands of different-looking groups, all changing by random chance.

Force 2: Natural Selection Natural selection is how groups of people slowly change to "fit" where they live. For example, scientists have studied skin color.[12] They found it's not a fixed "family" trait, but a way the body adapts to sunlight:

Near the Equator: Darker skin has more melanin, acting like a natural sunscreen.[13]

Near the Poles: Lighter skin is better at soaking up weak sun to make Vitamin D.

If a "Hamitic" family moved to cold, dark Siberia, natural selection would favor children with lighter skin over many generations. If a "Japhetic" family moved to the sunny equator, it would favor darker skin. The trait isn't a permanent "family stamp"; it's a changeable feature that adapts to survive.

The Biggest Problem: People Mix!

The "discrete families" idea has one central rule: the families cannot mix. But is that what people actually do?

Gene Flow: The Great "Mixing" Force In population genetics, there is a force called "gene flow."[14] This is the scientific term for when groups mix. When people from different towns, countries, or tribes meet and have families, their genes "flow" together. Gene flow is a "homogenizing" force—it makes things more similar.[15]

Admixture: The Story of Everyone The history of people is not like a "candelabra" (a candle holder with separate, branching arms that never touch). Instead, human history is like a network or a trellis, where the branches split apart and then come back together.[16]

This mixing is called "admixture."[17] This isn't a rare thing; it's the rule for all of human history. Scientists can look at the DNA of any person and see the admixture from different ancient groups. Studies of African Americans show a history of constant gene flow,[18] as do studies of people in Cambodia.[19]

Modern genetics has proven that there's no such thing as a "pure" ethnic group for anyone.[20][21]

Deconstructing "Biological Ethnicity"

Is there a scientific basis for "biological ethnicity"? The scientific answer is no. Modern science has proven that "race," as a biological idea, is false.[23] The belief that humans are divided into a few separate biological groups is a form of fake science called "scientific racism."[24]

After finishing the Human Genome Project, scientists confirmed that all humans are about 99.9% identical in their DNA.[25] Race and ethnicity are very real socially, but they are not a biological reality. In fact, 73% of scientists disagree that "race" is a useful way to think about ancestry at all.[26]

Genetic Ancestry and Ethnic Identity

DNA ancestry tests do not and cannot tell you your "biological ethnicity" because no such thing exists.[29] When a test report claims you are "43% Nigerian," it is crucial to understand that this is not a measurement of ancient blood or a validation of a distinct biological race.[34] It is a statistical estimate derived from a comparison with a modern reference database—a database that is subjective, incomplete, and relies heavily on conjecture.

The "Nigerian" DNA category in these tests is not based on the DNA of people who lived in Nigeria 200 or 2,000 years ago. Instead, testing companies build their "reference panels" using DNA from people living in Nigeria today, often relying on self-reported ancestry to qualify them. This presents a massive scientific problem: modern populations are heterogeneous and diverse. The people living in Nigeria today are not clones of an ancient ancestor; they are a complex mix of over 250 distinct ethnic groups (like the Yoruba, Igbo, and Hausa) who have different genetic histories.

Crucially, the DNA of these modern populations is not a unified, static "ancient signature" shared by all inhabitants. Rather, it is a modern, messy composite of diverse genetic markers—many of which are unshared between the different regions and tribes within Nigeria itself. A "Nigerian" reference panel effectively lumps this rich, regional diversity into a single statistical bucket. Therefore, matching this bucket does not prove descent from a pure, ancient lineage; it merely indicates that your DNA shares segments with a highly heterogeneous crowd of modern people who happen to live within borders drawn by the British in 1914. To interpret this modern statistical correlation as proof of an ancient biological "kind" is a scientific error of the highest order.

Furthermore, the "43%" figure is not an objective fact; it is a proprietary guess. If you send your DNA to three different companies, you will likely receive three different ethnicity estimates. One might say you are "Nigerian," while another labels the same DNA segment as "Benin/Togo" or simply "West African." This happens because each company uses a different, private algorithm to interpret the data. If a company updates its software or adds more modern people to its database, your "ethnicity" can change overnight. These results are probability games, not biological absolutes. Presenting these modern social categories as ancient biological facts inadvertently reinforces the very biological essentialism that genetics has disproven.[35][36][37]

The Rainbow of Human Variation

How does science see human traits? The answer is clinal variation.[38] This means that human traits (like skin color or height) exist on a smooth spectrum, like a rainbow.[39][40]

Skin color changes gradually from darker to lighter as you move away from the equator.[41] There is no "black" gene or "white" gene.[42] As the American Association of Biological Anthropologists stated: "Humans are not divided biologically into distinct continental types or racial genetic clusters."[43]

The "Within vs. Between" Principle

The vast majority of human genetic variation is found within any single population group, not between different groups.

85% to 94% of all human genetic variation can be found within any given local population (e.g., within the Italian population).[44]

Only 6% to 15% of our total genetic variation actually distinguishes one continental population from another.

This means that two randomly chosen individuals from the same ethnic group are likely to have more genetic differences between them than one of them has with a random individual from a completely different ethnic group.[45][46][47]

The Science of Identity: Why "Irishness" is Not a Biological Trait 

The very people the "pure families" idea assumes are one "family" are, in fact, one of the best-documented examples of deep and complex mixing in history.[55] The assertion that there is a "biological" or "genetically pure" Irish ethnicity is a fundamental category error that conflates social identity with biological reality. Academic researchers distinguish sharply between ethnicity—a fluid social construct based on shared culture, language, and history—and ancestry, which is a biological record of who mated with whom.[56] While "Irish" is a meaningful cultural label, it is not a discrete biological category. Geneticists do not find a distinct, exclusive set of genes that neatly separates people who live in Ireland from their neighbors. Instead, they find a continuous gradient of genetic variation that reflects geography and migration, not essentialist racial or so-called "bio-ethnic" boundaries.[57]

The myth of a static, indigenous biological lineage collapses immediately upon examining the island's deep history. Ancient DNA analysis has proven that the prehistoric population of Ireland was never stable or biologically continuous. The island’s first inhabitants, Mesolithic hunter-gatherers, were largely replaced by Neolithic farmers, who were in turn almost entirely replaced during the Bronze Age by migrants carrying ancestry from the Pontic-Caspian Steppe.[58] This massive demographic turnover around 2,500 BC demonstrates that the "native" population at any given time was often genetically distinct from the one that came before it. There is no ancient, unbroken thread of DNA that defines an eternal Irish people; there is only the history of whoever happened to be living on the island at the time.

Furthermore, the genetic structure of the modern population does not map neatly onto national or ethnic borders. What some might interpret as "Irish DNA" is actually just a collection of subtle regional variations that are part of a broader European continuum. Large-scale genomic studies, such as the Irish DNA Atlas, reveal that genetic clusters in Ireland are localized and geographic (e.g., distinct groups in West Munster or Ulster) rather than national.[59] Crucially, these genetic signatures often bleed across national lines; for example, populations in Northern Ireland often share more genetic affinity with populations in Western Scotland than they do with people in the south of Ireland, reflecting the Plantations and centuries of movement across the Irish Sea.[60] This "isolation by distance" creates a spectrum of variation, not a closed genetic box.

Ultimately, historical migrations—from the Vikings and Normans to the English and Scots—did not "mix" into a pre-existing "pure" race. Instead, they illustrate that the gene pool of the island has always been a porous, evolving reservoir of diversity. For instance, the so-called "Black Irish" phenotype is often mythologized as a result of the Spanish Armada or distinct racial origins, but genomic research indicates it is simply an expression of natural genetic variation found within these broader European migratory patterns.[61] To claim a biological basis for Irish ethnicity is to impose a modern political invention onto a biological reality that has never respected such boundaries. Being Irish is a matter of culture and belonging, not a biological imperative written in the blood.

Conclusion: One Big, Mixed-Up Family

Science shows that the story of humanity is not one of purity and separation. It is a beautiful, complex story of movement, adaptation, and constant mixing.

• Things Change: Groups change randomly (genetic drift) and adapt to their homes (natural selection).
   
• People Mix: History is about gene flow and admixture, which makes "pure" lines impossible.
   
• There Are No "Boxes": Trait boundaries are clinal—a smooth spectrum, not separate bins.
   
• We Are All Alike: We are 99.9% identical. Diversity is highest within groups, not between them.
   
• It’s a Disproven Idea: The unbiblical and unscientific "Shem, Ham, Japheth" model of unmixed biological families was used to justify racism in the 1800s, but real genetics has proven it wrong.[48][49][50][51]

Having established the unity of the human race as the one true "created kind," we can return to the natural family with clarity. The principles that govern the family are specific to its procreative nature and cannot be distorted to serve racial ends. We can now proceed to examine the foundation of the family: the sexual binary of male and female, and their distinct vocations as husband and wife, father and mother.

END NOTES:

[1] "The Table of Nations (from the sons of Noah) and the Babel dispersion event (Gen 11:1-9; cp. Deut 32:8-9)," DRMSH (blog), accessed October 29, 2025, https://drmsh.com/genesis-13-face-compatible-genome-research/.

[2] "Population bottleneck," Wikipedia, last modified October 20, 2025, accessed October 29, 2025, https://en.wikipedia.org/wiki/Population_bottleneck.

[3] "A Population-Genetic Test of Founder Effects and Implications," The American Journal of Human Genetics 77, no. 2 (August 2005): 317–18, https://pmc.ncbi.nlm.nih.gov/articles/PMC1216062/.

[4] "Founder effect," Wikipedia, last modified October 22, 2025, accessed October 29, 2025, https://en.wikipedia.org/wiki/Founder_effect.

[5] "Recent demographic history has affected patterns of deleterious variants in human populations," Genetics 203, no. 1 (May 2016): 327–39, https://pmc.ncbi.nlm.nih.gov/articles/PMC5299519/.

[6] "When a newly formed colony is small, its founders can strongly affect the population's genetic makeup far into the future," in "Founder effect," Wikipedia, last modified October 22, 2025.

[7] S. P. P. Pääbo, "The principal effect of a postbottleneck expansion in population size is to increase the number of low-frequency genetic variants," Molecular Biology and Evolution 17, no. 1 (January 2000): 2–14, https://academic.oup.com/mbe/article/17/1/2/975516.

[8] A. Manica et al., "The effect of ancient population bottlenecks on human phenotypic variation," Nature 448, no. 7151 (July 2007): 346–48, https://pmc.ncbi.nlm.nih.gov/articles/PMC1978547/.

[9] "Genetic Drift," National Human Genome Research Institute, accessed October 29, 2025, https://www.genome.gov/genetics-glossary/Genetic-Drift.

[10] Andrew J. Bohonak, "Genetic Drift in Human Populations," Encyclopedia of Life Sciences (April 30, 2008), https://biology.sdsu.edu/pub/andy/Bohonak2008.pdf.

[11] "Genetic Drift and Natural Selection," National Institute of Justice, accessed October 29, 2025, https://nij.ojp.gov/nij-hosted-online-training-courses/population-genetics-and-statistics-for-forensic-analysts/population-theory/hardy-weinberg-principle/genetic-drift-and-natural-selection.

[12] "Human skin color," Wikipedia, last modified October 25, 2025, accessed October 29, 2025, https://en.wikipedia.org/wiki/Human_skin_color; C. C. Cerqueira et al., "Several genome-wide association studies have identified...genes associated with skin color variation," G3: Genes, Genomes, Genetics 6, no. 5 (May 2016): 1251–59.

[13] "Human skin color," Wikipedia.

[14] "Population mixing and the adaptive divergence of quantitative traits in discrete populations," Evolution 55, no. 3 (March 2001): 459–66, https://pmc.ncbi.nlm.nih.gov/articles/PMC6691220/.

[15] "Models to study gene flow," INFLIBNET Centre, accessed October 29, 2025, https://ebooks.inflibnet.ac.in/antp08/chapter/models-to-study-gene-flow/.

[16] "A Candelabra Model of Human Evolution," Human Population Genetics and Genomics 3, no. 3 (2023): 0005, https://www.pivotscipub.com/hpgg/3/3/0005/pdf.

[17] J. K. Pritchard et al., "Inferring Population Structure and Admixture Proportions...," Genetics 155, no. 2 (June 2000): 945–59, https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1002967.

[18] "The Genetic Admixture of African Americans," American Journal of Human Genetics 63, no. 6 (December 1998): 1773–81; J. Adams and R. H. Ward, "Admixture studies and the detection of selection," Science 180, no. 4091 (June 1973): 1137–43.

[19] J. K. Pritchard et al., "Inferring Population Structure and Admixture Proportions...," Genetics 155, no. 2 (June 2000).

[20] "A Candelabra Model of Human Evolution," Human Population Genetics and Genomics 3, no. 3 (2023).

[21] J. K. Pritchard et al., "Inferring Population Structure and Admixture Proportions...," Genetics 155, no. 2 (June 2000).

[22] "A Candelabra Model of Human Evolution," Human Population Genetics and Genomics 3, no. 3 (2023).

[23] "Race (human categorization)," Wikipedia, last modified October 27, 2025; "Race and genetics," Wikipedia, last modified October 23, 2025.

[24] "Scientific racism," Wikipedia, last modified October 26, 2025.

[25] "Race and genetics vs. 'race' in genetics: A systematic review...," Evolution, Medicine, and Public Health 9, no. 1 (2021): 289.

[26] M. L. Dickin, "A Survey of Scientists on Race and Genetics," Public Understanding of Science 28, no. 1 (January 2019): 1–16.

[27] R. Craford-Smith, "Why genetic ancestry testing is incapable of predicting ethnicity," Ethnic and Racial Studies (2025), https://www.tandfonline.com/doi/full/10.1080/17449057.2025.2464506.

[28] Richard D. Alba, Ethnic Identity: The Transformation of White America (New Haven: Yale University Press, 1990), referenced in "Genetic ancestry testing vs cultural ethnicity," The American Journal of Sociology 180 (2024): 32.

[29] Franz Boas, "Changes in Bodily Form of Descendants of Immigrants," American Anthropologist 14, no. 3 (July-Sept 1912): 530–62.

[30] "ASHG Statement on Ancestry Testing," American Society of Human Genetics (November 2008), https://www.ashg.org/wp-content/uploads/2008/11/Statement-20081311-ASHGAncestryTesting.pdf.

[31] M. L. Dickin, "A Survey of Scientists on Race and Genetics," Public Understanding of Science 28, no. 1 (January 2019).

[32] C. D. Royal et al., "Inferring Genetic Ancestry: Opportunities, Challenges, and Implications," American Journal of Human Genetics 86, no. 5 (May 2010): 661–73.

[33] "ASHG Statement on Ancestry Testing," ASHG.

[34] R. Craford-Smith, "Why genetic ancestry testing is incapable of predicting ethnicity," Ethnic and Racial Studies (2025).

[35] "Genetic ancestry testing vs cultural ethnicity," The American Journal of Sociology 180 (2024): 32.

[36] Richard D. Alba, Ethnic Identity: The Transformation of White America (New Haven: Yale University Press, 1990).

[37] "AABA Statement on Race & Racism," American Association of Biological Anthropologists (March 27, 2019), https://bioanth.org/about/aaba-statement-on-race-racism/.

[38] "Clinal Variation," Social Science LibreTexts, accessed October 29, 2025.

[39] "Clinal Variation," Fiveable, accessed October 29, 2025, https://fiveable.me/key-terms/biological-anthropology/clinal-variation.

[40] "Clinal variation challenges traditional concepts of race by illustrating that human biological traits exist on a spectrum," Fiveable.

[41] "Geographical Distribution of Skin Color Prior to 1500 A.D.," Hawaii.edu, accessed October 29, 2025.

[42] American Journal of Physical Anthropology 162 (2017): 37–57.

[43] "AABA Statement on Race & Racism," AABA.

[44] "Human Skin Color Variation," Smithsonian Institution, last modified August 1, 2024, accessed October 29, 2025.

[45] "AABA Statement on Race & Racism," AABA.

[46] "Biological variability exists but this variability does not conform to the discrete packages labeled races," Evolution, Medicine, and Public Health 9, no. 1 (2021).

[47] "AABA Statement on Race & Racism," AABA.

[48] I. Nasidze et al., "Close genetic relationship between Semitic-speaking and Indo-European-speaking groups in Iran," Annals of Human Genetics 72, pt. 2 (March 2008): 241–52.

[49] I. Nasidze et al., "Close genetic relationship between Semitic-speaking and Indo-European-speaking groups in Iran," Annals of Human Genetics 72.

[50] I. Nasidze et al., "Close genetic relationship between Semitic-speaking and Indo-European-speaking groups in Iran," Annals of Human Genetics 72.

[51] Aaron P. Ragsdale et al., "A weakly structured stem for human origins in Africa," Nature 629, no. 7991 (May 2024): 603-611.

[52] I. Lazaridis et al., "Ancient human genomes suggest three ancestral populations for present-day Europeans," Nature 513, no. 7518 (September 2014): 409–13.

[53] "Modern Europeans Descended From Three Groups of Ancestors," Howard Hughes Medical Institute (HHMI), September 17, 2014.

[54] "The genomic ancestry of present-day Europeans is a mixture of three ancestral groups," Berkeley News, June 23, 2022.

[55] "Identity by descent (IBD) analyses find genomic blocks...," Nature Communications 8, no. 1 (November 2017): 1467.

[56] National Human Genome Research Institute, "Population Descriptors in Genomics," accessed December 31, 2025, https://www.genome.gov/about-genomics/policy-issues/population-descriptors-in-genomics.

[57] Richard A. Lewontin, "The Apportionment of Human Diversity," Evolutionary Biology 6 (1972): 381-398; see also "Race and Genetics," Wikipedia, accessed December 31, 2025, https://en.wikipedia.org/wiki/Race_and_genetics.

[58] Edmund Gilbert et al., "The Irish DNA Atlas: Revealing Fine-Scale Population Structure and History within Ireland," Scientific Reports 7, no. 17199 (2017); see also "Genetic History of Europe," Wikipedia, accessed December 31, 2025, https://en.wikipedia.org/wiki/Genetic_history_of_Europe.

[59] Gilbert et al., "The Irish DNA Atlas."

[60] Ross P. Byrne et al., "Insular Celtic Population Structure and Genomic Footprints of Migration," PLOS Genetics 14, no. 1 (2018): e1007152; see also Gilbert et al., "The Irish DNA Atlas."

[61] "The True Genetic Roots of the Irish People Finally Explained," Epic Discovery, YouTube video, posted 2024, https://www.youtube.com/watch?v=xGfwSkFgAAQ; see also "Black Irish," AskHistorians, Reddit, accessed December 31, 2025, https://www.reddit.com/r/AskHistorians/comments/42uvp2/why_is_my_pureblooded_irish_father_dark_skinned/.3