Genetics are small parts of DNA. You have nearly 20,000 but all your genes are so small that they fit in one nucleus. Your nucleus contains 99.9% of your genes the mitochondria contains a few more genes.If you measure all your genes it will measure 6ft long.
The long molecules of DNA containing your genes are organized into small pieces called chromosomes,different species have different numbers of chromosomes. Humans usually have 46 chromosomes.
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