Uploaded September 2024 | Updated September 2026, 1 week ago
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Do We All Share a Common Genetic Ancestor? Genetic Adam and Eve Explained
Chapters:
0:00 Intro
1:47 Mitochondrial Eve
3:20 Population Bottlenecks & The Supervolcanic Eruption of Mount Toba in Indonesia
5:28 Y-Chromosomal Adam
6:56 Why Did They Not Live at the Same Time?
Do we all share a common ancestor? Well scientists believe we do, and men actually have two of them. They are known amongst geneticists as Mitochondrial Eve and Y-chromosomal Adam, and although they are named after the biblical figures of Adam and Eve, they don’t have anything to do with the bible. Instead, they represent the most recent common ancestors (MRCA) in the human gene pool for different parts of our genetic material. But who were these people and how long ago did these people live, and it may surprise you that they didn’t live at the same time?
Now as a quick overview, Homo sapiens, our species, first appeared around 200,000 to 300,000 years ago in Africa. As Homo sapiens spread across the globe, populations intermingled and passed on their genes, resulting in the vast genetic diversity we observe today. This included interbreeding with different archaic forms of humans, such as the Neanderthals, which I covered in my last video. Despite this diversity, every living human shares a common genetic heritage, much of which can be traced back to specific individuals or populations through various forms of genetic analysis.
The study of genetic common ancestors stems from the understanding that certain parts of our DNA are passed down relatively unchanged from generation to generation. Although your autosomal DNA, which is the bulk of your DNA, changes quite a lot between generations, which is why autosomal DNA tests are only accurate going back say around 5-7 generations, other small parts of your DNA have been relatively stable over time, with only very small mutations. These are of course Y-chromosomes for men, which are passed down from fathers to sons, and mitochondrial DNA on the maternal side, which is passed from mothers to their children. Hence tracing these parts of our DNA can give us a fascinating glimpse into our ancient past, and I do mean ancient.
Now let’s start with Mitochondrial Eve.
Sources:
Scientists Think They've Found 'Mitochondrial Eve's' First Homeland | Live Science
Chan, E.K.F., Timmermann, A., Baldi, B.F. et al. Human origins in a southern African palaeo-wetland and first migrations. Nature 575, 185–189 (2019). doi.org/10.1038/s41586-019-1714-1
An African American Paternal Lineage Adds an Extremely Ancient Root to the Human Y Chromosome Phylogenetic Tree - Wayback Machine (archive.org)
Mendez FL, Poznik GD, Castellano S, Bustamante CD. The Divergence of Neandertal and Modern Human Y Chromosomes. Am J Hum Genet. 2016 Apr 7;98(4):728-34. doi: 10.1016/j.ajhg.2016.02.023. PMID: 27058445; PMCID: PMC4833433.
Y-chromosomal Adam - Wikipedia
G. David Poznik et al. Sequencing Y Chromosomes Resolves Discrepancy in Time to Common Ancestor of Males Versus Females. Science 341 ,562-565 (2013). DOI:10.1126/science.1237619
Rohde, D., Olson, S. & Chang, J. Modelling the recent common ancestry of all living humans. Nature 431, 562–566 (2004). doi.org/10.1038/nature02842
No, a Mitochondrial 'Eve' Is Not the First Female in a Species | Smithsonian (smithsonianmag.com)
Mitochondrial Eve - Wikipedia
Callaway, E. Genetic Adam and Eve did not live too far apart in time. Nature (2013). doi.org/10.1038/nature.2013.13478
Study Shows How Humanity Survived The Toba Supervolcano Eruption (forbes.com)
Global climate disruption and regional climate shelters after the Toba supereruption | PNAS
'Mitochondrial Eve': Mother of all humans lived 200,000 years ago - sciencedaily.com/releases/2010/08/100817122405.htm
Cann, R., Stoneking, M. & Wilson, A. Mitochondrial DNA and human evolution. Nature 325, 31–36 (1987). doi.org/10.1038/325031a0
Macro-haplogroup L - Wikipedia
Haplogroup A (Y-DNA) - Wikipedia
Villanea, F.A., Schraiber, J.G. Multiple episodes of interbreeding between Neanderthal and modern humans. Nat Ecol Evol 3, 39–44 (2019). doi.org/10.1038/s41559-018-0735-8
Creative Commons Imagery:
Jordi picart File:MtDNA inheritance.svg - Wikimedia Commons Creative Commons Attribution-Share Alike 4.0 International license. Deed - Attribution-ShareAlike 4.0 International - Creative Commons
C. Rottensteiner File:MtDNA-MRCA-generations-Evolution.svg - Wikimedia Commons Creative Commons Attribution-Share Alike 3.0 Unported license. Deed - Attribution-ShareAlike 3.0 Unported - Creative Commons
#ancestry #dna #genetics
Subscribe to Celtic History Decoded: youtube.com/channel/UCCS3M_uNHH2iOJkpGhkO2SA?sub_confirmation=1
Please Buy Me a Coffee - buymeacoffee.com/celtichistory
Please support this channel on Patreon and get ad-free videos and other benefits: patreon.com/historydecoded
Do We All Share a Common Genetic Ancestor? Genetic Adam and Eve Explained
Chapters:
0:00 Intro
1:47 Mitochondrial Eve
3:20 Population Bottlenecks & The Supervolcanic Eruption of Mount Toba in Indonesia
5:28 Y-Chromosomal Adam
6:56 Why Did They Not Live at the Same Time?
Do we all share a common ancestor? Well scientists believe we do, and men actually have two of them. They are known amongst geneticists as Mitochondrial Eve and Y-chromosomal Adam, and although they are named after the biblical figures of Adam and Eve, they don’t have anything to do with the bible. Instead, they represent the most recent common ancestors (MRCA) in the human gene pool for different parts of our genetic material. But who were these people and how long ago did these people live, and it may surprise you that they didn’t live at the same time?
Now as a quick overview, Homo sapiens, our species, first appeared around 200,000 to 300,000 years ago in Africa. As Homo sapiens spread across the globe, populations intermingled and passed on their genes, resulting in the vast genetic diversity we observe today. This included interbreeding with different archaic forms of humans, such as the Neanderthals, which I covered in my last video. Despite this diversity, every living human shares a common genetic heritage, much of which can be traced back to specific individuals or populations through various forms of genetic analysis.
The study of genetic common ancestors stems from the understanding that certain parts of our DNA are passed down relatively unchanged from generation to generation. Although your autosomal DNA, which is the bulk of your DNA, changes quite a lot between generations, which is why autosomal DNA tests are only accurate going back say around 5-7 generations, other small parts of your DNA have been relatively stable over time, with only very small mutations. These are of course Y-chromosomes for men, which are passed down from fathers to sons, and mitochondrial DNA on the maternal side, which is passed from mothers to their children. Hence tracing these parts of our DNA can give us a fascinating glimpse into our ancient past, and I do mean ancient.
Now let’s start with Mitochondrial Eve.
Sources:
Scientists Think They've Found 'Mitochondrial Eve's' First Homeland | Live Science
Chan, E.K.F., Timmermann, A., Baldi, B.F. et al. Human origins in a southern African palaeo-wetland and first migrations. Nature 575, 185–189 (2019). doi.org/10.1038/s41586-019-1714-1
An African American Paternal Lineage Adds an Extremely Ancient Root to the Human Y Chromosome Phylogenetic Tree - Wayback Machine (archive.org)
Mendez FL, Poznik GD, Castellano S, Bustamante CD. The Divergence of Neandertal and Modern Human Y Chromosomes. Am J Hum Genet. 2016 Apr 7;98(4):728-34. doi: 10.1016/j.ajhg.2016.02.023. PMID: 27058445; PMCID: PMC4833433.
Y-chromosomal Adam - Wikipedia
G. David Poznik et al. Sequencing Y Chromosomes Resolves Discrepancy in Time to Common Ancestor of Males Versus Females. Science 341 ,562-565 (2013). DOI:10.1126/science.1237619
Rohde, D., Olson, S. & Chang, J. Modelling the recent common ancestry of all living humans. Nature 431, 562–566 (2004). doi.org/10.1038/nature02842
No, a Mitochondrial 'Eve' Is Not the First Female in a Species | Smithsonian (smithsonianmag.com)
Mitochondrial Eve - Wikipedia
Callaway, E. Genetic Adam and Eve did not live too far apart in time. Nature (2013). doi.org/10.1038/nature.2013.13478
Study Shows How Humanity Survived The Toba Supervolcano Eruption (forbes.com)
Global climate disruption and regional climate shelters after the Toba supereruption | PNAS
'Mitochondrial Eve': Mother of all humans lived 200,000 years ago - sciencedaily.com/releases/2010/08/100817122405.htm
Cann, R., Stoneking, M. & Wilson, A. Mitochondrial DNA and human evolution. Nature 325, 31–36 (1987). doi.org/10.1038/325031a0
Macro-haplogroup L - Wikipedia
Haplogroup A (Y-DNA) - Wikipedia
Villanea, F.A., Schraiber, J.G. Multiple episodes of interbreeding between Neanderthal and modern humans. Nat Ecol Evol 3, 39–44 (2019). doi.org/10.1038/s41559-018-0735-8
Creative Commons Imagery:
Jordi picart File:MtDNA inheritance.svg - Wikimedia Commons Creative Commons Attribution-Share Alike 4.0 International license. Deed - Attribution-ShareAlike 4.0 International - Creative Commons
C. Rottensteiner File:MtDNA-MRCA-generations-Evolution.svg - Wikimedia Commons Creative Commons Attribution-Share Alike 3.0 Unported license. Deed - Attribution-ShareAlike 3.0 Unported - Creative Commons
#ancestry #dna #genetics
