Things that are not and never were alive (rocks, cars, or lollypops for instance) do not have DNA.
DNA is made by living things and is found in living things. Once those animals and plants and such die, you can still find their DNA if the conditions are right. For instance, you can pick an onion and keep it in proper storage for months and still get some DNA out of it. But, store it poorly and the whole thing will rot, including the DNA. The whole Jurassic Park movie was based on the idea that prehistoric animal DNA was "properly" stored in amber and thus, the creatures could be cloned back into existence.
And, forensically speaking, one can find DNA wherever a living thing
has left some behind. Humans leave their DNA all over the place. Whenever
you shed skin or hair or saliva (cheek cells will be in the saliva), your
DNA can be found. If you lick a stamp, you may very well leave enough DNA
behind for the forensic experts to say it was you who licked the stamp.
Dear Dr. Smith,
The best I can find, there are 'trillions' of cells in the human body.
There are 23 pairs of chromosomes, or 46 strands of DNA per cell (not
counting eggs and sperm). So generally speaking there would be more than
There is an intriguing estimate of the length of DNA in the human body. If all the DNA from an average person is laid end to end, it would stretch from here to the sun, and back, 30 times.
Thanks for your question.
you have info on the human genome project? If not do you know where I
can get some? I would be very grateful.
The first is probably easier to understand.
And the second is the government's main site for the project.www.nhgri.nih.gov
Good luck to you daughter on her project.
Learn more! Google:
cell science projects
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