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Chromosomes, genes, DNA - Coggle Diagram
Chromosomes, genes, DNA
DNA 
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Except for identical twins, each person's DNA is unique
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DNA can be cut and separated forming a sort of "bar code" that is different from one person to the next.
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Chromosomes
These are long threads of DNA, each made up of many genes
Humans have 22 pairs of chromosomes
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Genes
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It is the unit of heredity, and may be copied and passed on the next generation.
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