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Ancient Genetics that Still Occur Today: Atavisms Explained

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Did you know that traits in animal species can re-appear in a new generation hundreds of years later? These ancient reappearing genetics are called Atavisms, and they can help us understand amazing things about biology and evolution, like how limbs actually grow! Join us for a fascinating new episode of SciShow, hosted by Hank Green.

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Sources:
Dollo’s Law/Atavisms
https://pubmed.ncbi.nlm.nih.gov/7991619/
https://doi.org/10.1016/j.tree.2008.06.013
https://doi.org/10.1002/ajmg.a.36234
Cetacean Hind Limbs
https://doi.org/10.1007/978-1-4899-0159-0_10
https://doi.org/10.1073/pnas.0602920103
https://doi.org/10.1046/j.1525-142X.2002.02033.x
Limpet Shell Twists
https://pubmed.ncbi.nlm.nih.gov/16701270/
https://doi.org/10.1098/rspb.2003.2517
Soil Mite Sex
https://doi.org/10.1073/pnas.0700034104
https://doi.org/10.1002/ece3.5303
https://doi.org/10.1016/0305-1978(92)90056-J
Big Bone Worm Males
https://doi.org/10.1016/j.cub.2014.11.032
https://doi.org/10.1016/j.crvi.2008.10.007
https://doi.org/10.1038/s41467-017-01002-8
https://doi.org/10.1186/1741-7007-7-74

Images:
https://commons.wikimedia.org/wiki/File:Anthracotherium_magnum.jpg
https://link.springer.com/article/10.1007/s12052-009-0135-2/figures/24
https://link.springer.com/article/10.1007/s12052-009-0135-2/figures/2
https://commons.wikimedia.org/wiki/File:Trochita_trochiformis_01.JPG
https://www.inaturalist.org/observations/19706160
https://www.inaturalist.org/observations/35191166
https://www.inaturalist.org/observations/32780129
https://www.inaturalist.org/observations/7073348
https://www.flickr.com/photos/jsjgeology/25447477923
https://www.flickr.com/photos/treegrow/31682185476
https://eol.org/media/6248881
https://www.flickr.com/photos/treegrow/39096881684
https://www.flickr.com/photos/treegrow/26010907628
https://www.flickr.com/photos/scrippsocean/15806618219/in/album-72157647375239253/
https://www.flickr.com/photos/scrippsocean/15806619019/in/album-72157647375239253/
https://www.flickr.com/photos/scrippsocean/15372997583/in/album-72157647375239253/