Chromosomes and genes | Inheritance and variation | Middle school biology | Khan Academy

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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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“Cute Puppies @ December 20, 2015 at 09:36AM” by Cute Dog Wallpapers [Public domain], via Flickr:

“Puppy” by Saran Chamling [Public domain], via Flickr:

“I give up....I surrender to your power and strength" by Beverly & Pack [Public domain], via Flickr:

“20190405-OSEC-LSC-0229" by Lance Cheung, USDA [Public domain], via Flickr:

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[BioAnswersStudent]

I wanted to ask a question to clarify some simple concepts. We always hear that we have two copies of every gene (one from father and another from mother). When we say that, do we mean the 5-3 strand and 3-5 strand double stranded DNA? Or do we mean that there are actually two copies of the gene, each having its own 5-3 strand and 3-5 strand?

[izavandeven]

What is that singing... I did not expect this style of explanation in a Khan Academy video...