You share half of your genetic code with a banana

Science · Published 27 October 2026 Swipe more like this →

In short: While it sounds like a biological prank, humans and bananas share roughly 50% of their DNA. Common ancestry occurs since DNA serves as the genetic substance within every cellular unit. You can actually pull these microscopic strings out of fruit using basic household items.

DNA is the fundamental chemical blueprint found in every living cell. Because it serves essential biological functions, certain core genes are conserved across diverse species, leading to the surprising fact that humans share about 50% of their DNA with bananas. This commonality highlights the deep evolutionary connections between different forms of life.

Extracting this material from fruit—like strawberries, kiwi, or watermelon—requires breaking down complex biological barriers. The process begins by mashing the fruit to separate cells and using salt water to begin weakening cell walls. Salt plays a specific role in the final stages by encouraging DNA molecules to clump together rather than remaining dispersed.

To release the DNA from its protective housing, scientists (and home experimenters) use dish detergent to rupture the cell membranes and nuclear envelopes. Because DNA is normally wound tightly around proteins, protease enzymes—found in meat tenderizers, pineapple juice, or contact lens cleaner—are added to uncoil these strings. Finally, ice-cold ethanol or isopropyl alcohol is layered on top. Since DNA is insoluble in cold alcohol but soluble in water, it precipitates out of the mixture, forming visible cloudy strings that can be collected.

This procedure demonstrates several core principles of biology: the structure of cell membranes, the role of enzymes in protein degradation, and the chemical properties of solubility. By manipulating these variables, you transform a dissolved solute into an insoluble substance, making the invisible instructions of life visible to the naked eye.

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