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Chromosome pairs | Inheritance and variation | Middle school biology | Khan Academy

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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“Black mulberry (Morus nigra) illustration from Traité des Arbre” by Rawpixel Ltd (CC BY 2.0), via Flickr:
Black mulberry (Morus nigra) illustration from Traité des Arbre

“Guinea pigs” by photon_de (CC BY 2.0), via Flickr:
Guinea Pigs

“234/365 – ::ding:: a stroke of genius” by B Rosen (CC BY-ND 2.0), via Flickr:
234/365 - ::ding:: a stroke of genius

“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:

“Pea flowers” by Greenstone Girl (CC BY-NC 2.0), via Flickr:
Pea Flowers

“Sweet pea ‘Lathyrus odoratus’ violet flower at Boreham, Essex, England 4” by Acabashi (CC BY-SA 4.0), via Wikimedia Commons:,_Essex,_England_4.jpg

Cell, chromosome, and DNA diagrams created with


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