Chromosome - Structure of DNA coiled around proteins , Genotype - The genetic constitution of an organism, Phenotype - set of observable characteristics or traits, Gene - a segment of DNA that codes for a protein, Nucleotide - Building block of DNA consisting of phosphate, sugar, and nitrogen base, Protein - large biomolecules composed of a string of amino acids , Nitrogen bases - A pairs with T; C pairs with G, Double Helix - Shape of DNA, Sister Chromatids - Copies of DNA held together at the centromere, Nucleus - Where DNA is located,

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