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I recently heard that you can extract visible DNA from a strawberry using just basic household materials. Apparently, because strawberries are octoploid — having eight copies of each chromosome — the DNA yield is high enough to see with the naked eye.
My kid had a science kit that said we would do this, but we never got that far.
This is a classic middle school science outreach activity, or something older elementary age kids might do at a summer science camp.