Genes are located in the chromosomes of cells, with each chromosome pair containing two variants of each of many distinct genes.
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“PLoSBiol3.5.Fig7ChromosomesAluFish” by Andreas Bolzer, Gregor Kreth, Irina Solovei, Daniela Koehler, Kaan Saracoglu, Christine Fauth, Stefan Müller, Roland Eils, Christoph Cremer, Michael R. Speicher, and Thomas Cremer (CC BY 2.5), via Wikimedia Commons:
“Sweet pea ‘Lathyrus odoratus’ violet flower at Boreham, Essex, England 4” by Acabashi (CC BY-SA 4.0), via Wikimedia Commons:
Cell, chromosome, and DNA diagrams created with Biorender.com: