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anon answered on 1 May 2020:
As the other scientists have said all our genetic information is in every cell of our body that has a nucleus. But not all that genetic information is active. When I was learning this at school one helpful analogy I found was that cells in your heart and brain have very different jobs to do. In order to do those different jobs they need different machinery and so different genes are active to supply the different machinery (proteins) those cells need to do their specialised jobs.
Sometimes the job of those cells can change over time and so different genes will become turned on and off in response to the changing needs of the cell.
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anon-251613 commented on :
Thank you all so much! These are amazing answers!