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unit 7 section 3

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trait
a physical feature that is determined by ones genes
mutation
a permanant change in the DNA that makes up a gene
DNA
a molecule that contains the code for an organism's traits
nucleotide
the basic unit of DNA that codes for proteins using adenine, cytosine, thymine and guanine
double helix
the spiral staircase shape of DNA
chromosome
small thread-like bundles of DNA
karyotype
a visual representation of the number, form and size of an organism's chromosome