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Biology

Your cells carry a second, separate genome 

Mitochondria have their own small circular DNA, inherited only from your mother. They are thought to descend from ancient bacteria absorbed by our ancestors' cells.

#biology#cells#dna

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Biology

One cell holds about two metres of DNA

Packed into a nucleus a few micrometres wide, your DNA is wound and coiled with astonishing efficiency. Stretched end to end, the DNA in your whole body would reach far beyond the Sun.

#biology#dna#cells

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Biology

You carry roughly as many bacterial cells as human ones

Current estimates put the ratio near one to one — tens of trillions of microbes, mostly in your gut, helping digest food and train your immune system.

#biology#microbiome#health