DNA, genes and chromosomes

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Last updated 2:10 PM on 1/13/26
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6 Terms

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Gene

A section of DNA that contains instructions for making a specific proportion or trait.

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Allele

Different versions of the same gene

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Homologous pair of chromosomes

A pair of chromosomes - A pair of chromosomes (one from each parent) that are the same size and shape and carry the same genes at the same loci.

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Locus

The specific location of a gene on a chromosome.

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Start codon

A sequence of three nucleotides (usually AUG) that signals the start of protein synthesis.

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Stop codon

A sequence of three nucleotides (UAA, UAG, or UGA) that signals the end of protein synthesis