Botanical geneticists sequencing the genome of the domesticated tomato discovered that it possesses over thirty-one thousand genes, which is roughly ten thousand more than a human being.

Why a Tomato Can Have More Genes Than a Human

A gene count is a tally of DNA stretches that can be used to make a functional product, often a protein. It is not a tally of independent abilities. Many genes act as components in shared systems, and a gene’s effect depends on when, where, and how strongly a cell uses it.

That control is crucial in a plant. A tomato cannot move away from drought, pests, or changing light, so its cells must adjust growth and chemistry in response. Different sets of genes switch on in roots, leaves, flowers, and ripening fruit. Signals from the environment can also change which genes are active, or how much of their products cells make.

More Instructions, Not Automatically More Complexity

Gene copies can arise over evolutionary time. A duplicated gene may keep its original task, divide that task with its copy, or gradually take on a different one. Such copies can give a plant extra options for managing development or stress—but they do not necessarily create a wholly new feature.

Complex traits emerge from interactions among genes, their control systems, and the cell’s surroundings. A fruit’s color and flavor, for instance, reflect coordinated chemical processes rather than a single “color gene” or “flavor gene.” The useful comparison, then, is not how many entries each genome contains, but what those instructions do together. A longer ingredient list can support a distinctive recipe without making the recipe inherently more elaborate.