Bananas are the fruit most commonly cited as genetically closest to humans, with a widely repeated figure of roughly 60% shared DNA. That number, while not fabricated, is easy to misunderstand. It refers to the fraction of human genes that have recognizable counterparts in the banana genome, not to some overall letter-by-letter match between the two species’ full genetic codes. The distinction matters because every fruit-bearing plant shares a surprisingly large chunk of its genetic toolkit with us, and the gap between banana and, say, grape or strawberry is far smaller than the gap between any of them and a chimpanzee.
What “Sharing DNA” Actually Means Here
When someone says humans and bananas share 60% of their DNA, they are usually talking about homologous genes: stretches of DNA whose sequences are similar enough that scientists can tell they descended from a common ancestor. Researchers identify these by comparing protein sequences across species, typically using alignment tools that score how closely two proteins resemble each other and then filtering out matches that could have occurred by chance.1Nucleic Acids Research. Measuring genome conservation across taxa: divided strains and united kingdoms The result is a count of gene pairs that are recognizably related between the two organisms.
This is very different from saying that 60% of the actual DNA letters (the A, T, G, and C bases) in a banana line up identically with yours. Humans and bananas diverged well over a billion years ago. Across that timescale, the non-coding parts of the genome have scrambled beyond recognition. What persists is the core set of instructions for running a cell: copying DNA, producing energy, managing proteins, dividing, and dying on schedule. Those instructions look similar in virtually every complex organism on the planet, and they make up the bulk of the “shared DNA” in any plant-to-human comparison.
Why Every Fruit Shares a Lot of DNA with You
Plants and animals split from a common single-celled ancestor somewhere around 1.5 to 1.6 billion years ago.2PubMed. The value of Arabidopsis research in understanding human disease states That ancestor already had the fundamental molecular machinery of a eukaryotic cell: a nucleus, mitochondria (or their precursors), ribosomes, histones wrapping DNA, enzymes handling metabolism, and a system for repairing damaged genetic material. All of those systems require genes, and because they perform the same essential jobs in every descendant lineage, natural selection has kept them remarkably similar across the entire tree of life.
These conserved genes, often called housekeeping genes, are the reason the “shared DNA” percentage between humans and any plant is already high before you even get to more specialized functions. The proteins that assemble ribosomes in a banana plant, for instance, are structurally similar to the ones that do the same job in your cells. The enzymes that copy DNA in a grape vine resemble the ones in your bone marrow. When you compare genomes at the level of protein-coding sequences, all of these conserved housekeeping genes count as matches, and they add up fast.
Where Bananas Stand
The banana genome was sequenced and annotated as part of a large international effort. The reference genome for the cultivated banana (Musa acuminata) contains roughly 36,500 predicted protein-coding genes, which is actually more than the approximately 20,000 in the human genome.3PubMed Central. The Banana Genome Hub That gene count is inflated partly because bananas, like many plants, went through ancient whole-genome duplication events that left extra copies of many genes behind.4PubMed Central. Positionally biased gene loss after whole genome duplication: evidence from human, yeast, and plant
When researchers compare banana proteins to those in other organisms, they find large sets of recognizable orthologs. For context, a comparison between banana and rice identified over 11,600 ortholog pairs, and both of those are monocot plants that diverged tens of millions of years ago.3PubMed Central. The Banana Genome Hub The banana-to-human comparison yields a smaller but still substantial set of matches, concentrated in the ancient housekeeping categories. The commonly cited “about 60%” figure refers to the share of human genes for which a detectably similar banana gene exists, not the reverse (since bananas have more total genes, the percentage going the other direction would be different).
Whether banana is truly “the closest” fruit to human DNA depends on the metric. Banana has received outsized attention partly because its genome was sequenced relatively early and because “you share 60% of your DNA with a banana” makes for an irresistible science-communication soundbite. The honest picture is that most well-studied fruit genomes land in a similar range when compared to humans, and the differences among fruits are modest relative to the enormous evolutionary distance between any plant and any animal.
How Other Fruit Genomes Compare
Grapes, strawberries, apples, tomatoes, and citrus fruits have all had their genomes sequenced and annotated. Each one contains roughly 25,000 to 45,000 predicted protein-coding genes, with the variation largely driven by lineage-specific duplications rather than by wildly different gene content. When these genomes are compared to the human genome using the same protein-alignment methods, the overlap in housekeeping and core cellular genes is broadly similar to what you see with banana.
No single fruit stands dramatically ahead of the pack. The reason is straightforward: the genes that plants share with humans are overwhelmingly the ones inherited from that shared eukaryotic ancestor over a billion years ago. A banana and a strawberry both carry versions of those ancient genes, and both versions have been drifting independently from the human version for the same length of time. Individual gene families might be slightly better preserved in one fruit lineage than another, but averaged across the whole genome, the differences are small.
The popular idea that bananas are uniquely close to humans genetically is less a statement about banana biology and more an artifact of which genome happened to be the subject of early outreach efforts. If the strawberry genome had been sequenced first and promoted with the same enthusiasm, you would probably see “you share 60% of your DNA with a strawberry” circulating just as widely.
Functional Conservation Goes Deeper Than Sequence Matching
Raw sequence similarity is only one way to measure genetic closeness. A more demanding test asks whether a gene from one species can actually do the job of its counterpart in another species. On that front, the conservation between plants and humans is sometimes startling.
A vivid example involves histone proteins, the spools around which DNA wraps inside the nucleus. One particular histone variant, called H2A.Z, is found in every eukaryote and plays a role in gene regulation. Researchers took plants that lacked their own H2A.Z and inserted human versions of the gene instead. Two of the three human H2A.Z variants fully rescued the mutant plants, restoring normal growth and development despite major differences in the protein’s tail region between the two species.5PubMed Central. Replacement of Arabidopsis H2A.Z with human H2A.Z orthologs reveals extensive functional conservation and limited importance of the N-terminal tail sequence for Arabidopsis development That kind of cross-kingdom gene swapping would be impossible if the shared DNA were just superficial sequence resemblance. The proteins are similar enough in three-dimensional structure and biochemical behavior to do the same job in radically different organisms.
Findings like this suggest that the genetic overlap between plants and humans is not just a historical relic. The shared genes are often still doing similar work in both lineages, even after more than a billion years of independent evolution.
Plants as Stand-Ins for Human Disease Research
The practical payoff of this deep genetic conservation is that researchers sometimes use plants to study processes relevant to human health. A comparison of annotated genome sequences revealed that a high percentage of genes linked to human diseases also exist in the small flowering plant Arabidopsis thaliana. Although Arabidopsis is not a fruit crop, it is the best-studied plant genome and serves as a proxy for understanding plant-human gene conservation broadly. Cellular processes associated with neurodegenerative conditions, including pathways relevant to Alzheimer’s and Parkinson’s disease, have been investigated using Arabidopsis as a model.2PubMed. The value of Arabidopsis research in understanding human disease states
This does not mean a banana plant gets Alzheimer’s. Plants lack nervous systems and do not develop the same diseases humans do. But the molecular building blocks involved in those diseases, the enzymes, the protein-folding machinery, the quality-control systems inside cells, are often conserved. A plant cell that misfolds a protein deals with the problem using machinery that resembles, at the molecular level, the machinery that fails in certain human brain diseases. Studying how the plant version works can reveal details that are harder to observe in animal models.
Fruit crops themselves are less commonly used as disease models because they are slower to grow and harder to manipulate in the lab. But the principle holds: the genes in a banana or a grape or a tomato that overlap with human disease genes are not inert leftovers. They are active parts of the plant’s biology, performing functions that parallel what their human counterparts do.
Why the “Percentage of Shared DNA” Number Is Slippery
If you search for this topic online, you will find confident-sounding numbers that vary considerably: 50%, 60%, even 70% for banana-human similarity, depending on the source. The variation is real and comes from methodological choices that are invisible to the casual reader.
The first variable is what you count as a “gene.” The human genome has roughly 20,000 protein-coding genes, but it also has thousands of RNA genes, regulatory elements, and other functional sequences. Some comparisons include only protein-coding genes; others cast a wider net. The second variable is the threshold for calling two genes “similar.” Researchers set a statistical cutoff to exclude matches that could have occurred by random chance.1Nucleic Acids Research. Measuring genome conservation across taxa: divided strains and united kingdoms A stricter cutoff produces a lower percentage; a more lenient one produces a higher one. The third variable is directionality: asking “what fraction of human genes have a banana match” gives a different number than asking “what fraction of banana genes have a human match,” because the two genomes have different total gene counts.
None of these choices is wrong, but they can produce genuinely different answers to the “same” question. The upshot is that no single percentage captures the full picture of plant-human genetic similarity. The commonly heard “60%” is a reasonable ballpark for the fraction of human protein-coding genes with detectable plant homologs, but treat it as a rough guide rather than a precise measurement.
Gene Sharing Across Kingdoms Is Not Always Vertical
Most of the genetic overlap between plants and humans traces back to their shared ancestor. But a small fraction of plant genes arrived by a different route: horizontal gene transfer, where DNA moves between unrelated organisms rather than being passed from parent to offspring. Plants swap genes with bacteria far more often than was once appreciated. A genomic analysis of Arabidopsis identified 75 unique proteins that had been horizontally transferred between the plant and bacteria, with the large majority acquired by the plant from microbial partners.6ISME Communications. Widespread horizontal gene transfer between plants and bacteria
Horizontal transfer between plants and animals is far rarer, so this phenomenon does not meaningfully change the human-fruit DNA comparison. But it does complicate the tidy picture of all shared genes being inherited from a common ancestor. Some genes in a banana’s genome might have arrived from soil bacteria rather than from the eukaryotic ancestor shared with humans. When researchers count “shared genes,” these bacterial acquisitions can create noise in the comparison, occasionally inflating or deflating the similarity score depending on whether the transferred gene happens to resemble something in the human genome.
Whole-Genome Duplication and Why Plants Have So Many Genes
One reason fruit genomes can feel confusingly large is that many plant lineages have undergone whole-genome duplication, a dramatic event in which the entire set of chromosomes gets copied. The banana lineage experienced multiple rounds of this, which is partly why it ended up with over 36,000 protein-coding genes despite being, by any intuitive measure, a simpler organism than a human. After duplication, some gene copies get lost, others take on new functions, and the genome slowly sheds redundancy. But the process is messy and incomplete, leaving plants with large families of related genes where humans have just one or two copies.4PubMed Central. Positionally biased gene loss after whole genome duplication: evidence from human, yeast, and plant
This matters for the “shared DNA” question because duplication creates multiple plant genes that all match the same single human gene. Depending on how a study handles these duplicates, the similarity percentage can shift. If you count each duplicate as a separate match, the percentage of human genes with plant counterparts goes up. If you collapse duplicates into families, it comes down. The banana’s inflated gene count, compared to humans, is one reason the popular “60%” figure should be taken with a grain of salt: the raw number of matching gene pairs may be high, but many of those pairs are banana-side duplicates tracing back to the same ancestral gene.
Apples have a similar story. The domesticated apple genome shows clear signs of an ancient whole-genome duplication, giving it roughly 57,000 predicted genes in some assemblies. Grapes, by contrast, did not undergo a recent duplication and have a leaner genome that is sometimes used as a reference point for what the ancestral plant genome looked like before all the copying events. These differences in genome history mean that the raw gene count in a fruit tells you more about that lineage’s duplication history than about how complex or how “human-like” the organism is.
What the Comparison Does and Does Not Tell You
Knowing that you share a large fraction of your genes with a banana is a genuinely interesting fact about biology. It illustrates how deeply conserved the molecular machinery of life is and how much of your genome is devoted to keeping basic cellular operations running rather than to making you specifically human. The genes that distinguish you from a plant, the ones involved in building a nervous system, an immune system, a skeleton, make up a relatively small fraction of your total gene count. Most of your DNA is busy with the same tasks a banana cell handles every day.
What the comparison does not tell you is that bananas are meaningfully more related to you than other fruits are. The evolutionary distance between humans and any flowering plant is essentially the same, because all flowering plants share a common ancestor that diverged from the animal lineage at the same point. A banana is not genetically closer to you than a mango or a blueberry in any biologically meaningful sense. The small differences that do exist between fruit-to-human similarity scores come from lineage-specific gene gains and losses, duplication events, and methodological quirks of genome comparison, not from some fruits being more “human-like” in their biology.
If the question is really “which organism is genetically closest to humans,” the answer is the chimpanzee, at roughly 98-99% DNA similarity depending on the metric. Fruit comparisons live in a completely different league, interesting for what they reveal about the shared foundations of cellular life but not indicative of any special kinship between you and your breakfast banana.