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Abstract
On August 31, 2011 at the 18th International Chromosome Conference in Manchester, Jenny Graves took on Jenn Hughes to debate the demise (or otherwise) of the mammalian Y chromosome. Sex chromosome evolution is an example of convergence; there are numerous examples of XY and ZW systems with varying degrees of differentiation and isolated examples of the Y disappearing in some lineages.
originally posted by: Annee
Here's an article from 2011/12 -- Is the Y chromosome disappearing?--both sides of the argument
Which also has links to similar articles.
Abstract
On August 31, 2011 at the 18th International Chromosome Conference in Manchester, Jenny Graves took on Jenn Hughes to debate the demise (or otherwise) of the mammalian Y chromosome. Sex chromosome evolution is an example of convergence; there are numerous examples of XY and ZW systems with varying degrees of differentiation and isolated examples of the Y disappearing in some lineages.
pubmed.ncbi.nlm.nih.gov...
originally posted by: TheMichiganSwampBuck
I wonder if it is nature's plan that men go extinct, will the remaining women reproduce by fission, budding, or virgin birth? Or will some women lose an arm from the second X, making it a Y?
originally posted by: quintessentone
originally posted by: Annee
Here's an article from 2011/12 -- Is the Y chromosome disappearing?--both sides of the argument
Which also has links to similar articles.
Abstract
On August 31, 2011 at the 18th International Chromosome Conference in Manchester, Jenny Graves took on Jenn Hughes to debate the demise (or otherwise) of the mammalian Y chromosome. Sex chromosome evolution is an example of convergence; there are numerous examples of XY and ZW systems with varying degrees of differentiation and isolated examples of the Y disappearing in some lineages.
pubmed.ncbi.nlm.nih.gov...
Of note is ..."disappearing in SOME lineages".
originally posted by: BeyondKnowledge3
a reply to: FlyersFan
You are not saying all this transgender stuff is just adopting something too soon that is scientifically inevitable?
I think it is something in the drinking water myself. Both the transgender and y chromosome stuff.
Did colonel Jack Ripper have it right?
originally posted by: Annee
originally posted by: quintessentone
originally posted by: Annee
Here's an article from 2011/12 -- Is the Y chromosome disappearing?--both sides of the argument
Which also has links to similar articles.
Abstract
On August 31, 2011 at the 18th International Chromosome Conference in Manchester, Jenny Graves took on Jenn Hughes to debate the demise (or otherwise) of the mammalian Y chromosome. Sex chromosome evolution is an example of convergence; there are numerous examples of XY and ZW systems with varying degrees of differentiation and isolated examples of the Y disappearing in some lineages.
pubmed.ncbi.nlm.nih.gov...
Of note is ..."disappearing in SOME lineages".
Interesting.
I did not see that
Until now, this was thought to be a peculiarity found in one isolated species, but new data suggest that the phenomenon of genes moving from sex chromosomes to autosomes is widespread among mammals, including humans.
Lead author Jennifer Hughes from the Whitehead Institute, USA, said: “Genes that have survived on the Y chromosome are extraordinarily long-lived and likely serve important biological functions. However, there are numerous exceptions where seemingly critical genes have been lost from the Y chromosome in certain mammals. In many cases, these genes were not actually eliminated but have found new homes in the genome.
The sex of human and other mammal babies is decided by a male-determining gene on the Y chromosome. But the human Y chromosome is degenerating and may disappear in a few million years, leading to our extinction unless we evolve a new sex gene.
The good news is two branches of rodents have already lost their Y chromosome and have lived to tell the tale.
A recent paper in Proceedings of the National Academy of Science shows how the spiny rat has evolved a new male-determining gene.
originally posted by: TheMichiganSwampBuck
I wonder if it is nature's plan that men go extinct, will the remaining women reproduce by fission, budding, or virgin birth? Or will some women lose an arm from the second X, making it a Y?
ETA: If you were the last man on an Earth populated by all women, I wonder if it would be analogous to the saying, "In the land of the blind, a one-eyed man is king"?
originally posted by: FlyersFan
Interesting article. Go to the link to read what is happening to the Y Chromosome. No time frame is given for when the Y Chromosome in humans will disappear - anywhere from a few thousand years to never. But it is shrinking and that has consequences.
Y Chromosome Vanishing
We were all taught that the X and Y genes determine sex. Women have a pair of XX chromosomes, and men XY. But what you might not have been taught is that the Y chromosome is much smaller, carrying around 55 genes compared to roughly 900 on the X.
All embryos are technically female until around 12 weeks, when a gene on the Y chromosome kicks in and male development starts (hence why men have nipples). However, it seems the Y chromosome wasn’t always so small – and that’s where the problem lies. It’s shrinking – and some scientists worry it could disappear altogether.
originally posted by: Astyanax
a reply to: chr0naut
...not only outside of, but directly contrary to every theory of evolution.
I see no contradiction. But you are right that this disappearing-Y-chromosome business is old news.
originally posted by: chr0naut
originally posted by: Astyanax
a reply to: chr0naut
...not only outside of, but directly contrary to every theory of evolution.
I see no contradiction. But you are right that this disappearing-Y-chromosome business is old news.
It means that you don't get millions of years for lifeforms to evolve, because they degrade towards reproductive inviability in a fraction of the time.
It doesn't mean that evolution doesn't happen, it does mean that it has to happen faster than usually proposed, and we need to adjust the theoretical frameworks to accommodate degeneration.
originally posted by: Astyanax
a reply to: chr0naut
...not only outside of, but directly contrary to every theory of evolution.
I see no contradiction. But you are right that this disappearing-Y-chromosome business is old news.