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a physical feature that is determined by ones genes


a permanant change in the DNA that makes up a gene


a molecule that contains the code for an organism's traits


the basic unit of DNA that codes for proteins using adenine, cytosine, thymine and guanine

double helix

the spiral staircase shape of DNA


small thread-like bundles of DNA


a visual representation of the number, form and size of an organism's chromosome

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