Y-Chromosomal Adam Older Than Thought: New Research

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Discussion Overview

The discussion centers around the concept of Y-Chromosomal Adam and recent research suggesting he may be older than previously thought. Participants explore the implications of this research, the nature of genetic transmission through Y-chromosomes and mitochondrial DNA, and the existence of other potential lineages.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants express surprise at the existence of a Y-Chromosomal Adam, comparing him to Mitochondrial Eve, and noting that he has male contemporaries with living descendants through non-patrilineal lines.
  • There is a discussion about the transmission of Y-chromosomal DNA being exclusively from father to son, similar to mitochondrial DNA from mother to child.
  • One participant questions whether any DNA can be tracked from father to daughter, leading to a clarification that while half of the DNA comes from each parent, it cannot be traced in a specific pattern over generations due to mixing.
  • A participant raises the possibility of another Y-Chromosomal Adam existing, suggesting that undiscovered lineages could alter our understanding of ancestry.
  • Another participant argues that the probability of multiple surviving lines decreases over time unless there is rapid population growth, indicating that finding a different "Adam" would imply a need to revise our understanding of ancestry further back in time.
  • There is a consideration of whether there exists a structure in sperm cells that could provide a father's contribution in a trackable way, similar to mitochondria.

Areas of Agreement / Disagreement

The discussion contains multiple competing views regarding the implications of the research on Y-Chromosomal Adam, the nature of genetic transmission, and the possibility of undiscovered lineages. No consensus is reached on these points.

Contextual Notes

Participants note limitations in tracking DNA patterns over generations and the assumptions involved in discussing the existence of multiple Y-Chromosomal Adams.

Pythagorean
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I didn't realize there was a counterpart to Mitochondrial Eve

wiki said:
His other male contemporaries also have descendants alive today, but not, by definition, through solely patrilineal descent.

This is in contrast to M Eve, whom I believe is actually a common ancestor to all of us.

The following article just presents new research saying YC Adam is older than previous research had found, but for me, it was the existence of a YC Adam that was novel.

http://www.sci-news.com/genetics/science-y-chromosomal-adam-01709.html
 
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That makes sense though since the Y is transmitted from father to son only just like mitochondrial DNA is transmitted from mother to child always.

I wonder though if there's any trackable DNA from father to daughter though?
 
Half of the DNA, but nothing you could track over many generations in a specific pattern (m->f->m->f?) because all those parts get mixed together from both parents.
 
Hrrrm.. then isn't possible there's another Y-chromosomal Adam and we just haven't found his lineage yet?
 
Over time, the probability that more than one line survives goes to zero (unless the population grows fast and exponentially, and it never did that over a long time). Another line would just mean we found the wrong "Adam" and have to go back more. If necessary, you could go back all the way to the first appearance of the male/female chromosome system - but Adam lived much later than that.
 
mfb said:
Half of the DNA, but nothing you could track over many generations in a specific pattern (m->f->m->f?) because all those parts get mixed together from both parents.

I was thinking whether there's some structure like mitochondria that comes from the sperm cell that has only a fathers contribution. That's what I meant by trackable DNA.
 

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