Ancient Genetics that Still Occur Today: Atavisms Explained

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. SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon:   / scishow   ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Kevin Bealer, Jacob, Katie Marie Magnone, D.A. Noe, Charles Southerland, Eric Jensen, Christopher R Boucher, Alex Hackman, Matt Curls, Adam Brainard, Jeffrey McKishen, Scott Satovsky Jr, James Knight, Sam Buck, Chris Peters, Kevin Carpentier, Patrick D. Ashmore, Piya Shedden, Sam Lutfi, Charles George, Christoph Schwanke, Greg ---------- Looking for SciShow elsewhere on the internet? Facebook:   / scishow   Twitter:   / scishow   Tumblr:   / scishow   Instagram:   / thescishow   ---------- Sources: Dollo’s Law/Atavisms https://pubmed.ncbi.nlm.nih.gov/7991619/ https://doi.org/10.1016/j.tree.2008.0... https://doi.org/10.1002/ajmg.a.36234 Cetacean Hind Limbs https://doi.org/10.1007/978-1-4899-01... https://doi.org/10.1073/pnas.0602920103 https://doi.org/10.1046/j.1525-142X.2... Limpet Shell Twists https://pubmed.ncbi.nlm.nih.gov/16701... 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)... Big Bone Worm Males https://doi.org/10.1016/j.cub.2014.11... https://doi.org/10.1016/j.crvi.2008.1... https://doi.org/10.1038/s41467-017-01... https://doi.org/10.1186/1741-7007-7-74 Images: https://commons.wikimedia.org/wiki/Fi... https://link.springer.com/article/10.... https://link.springer.com/article/10.... https://commons.wikimedia.org/wiki/Fi... https://www.inaturalist.org/observati... https://www.inaturalist.org/observati... https://www.inaturalist.org/observati... https://www.inaturalist.org/observati... https://www.flickr.com/photos/jsjgeol... https://www.flickr.com/photos/treegro... https://eol.org/media/6248881 https://www.flickr.com/photos/treegro... https://www.flickr.com/photos/treegro... https://www.flickr.com/photos/scripps... https://www.flickr.com/photos/scripps... https://www.flickr.com/photos/scripps...