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Evolution! - R_P - Jul 13, 2024 - 10:34am
 
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Index » Regional/Local » USA/Canada » Evolution! Page: 1, 2, 3 ... 121, 122, 123  Next
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Posted: Jul 13, 2024 - 10:34am

Early Humans Left Africa Much Earlier Than Previously Thought
Scientists have found evidence of several waves of migration by looking at the genetic signatures of human interbreeding with Neanderthals.
Dr. Paabo’s team also discovered that living, non-African people carry fragments of Neanderthal DNA, a signature of interbreeding from long ago. In May, a team of researchers estimated that Neanderthals and modern humans interbred during a short period of time, between 47,000 and 40,000 years ago.

But some Neanderthal DNA does not fit into this neat picture. The Neanderthal Y chromosome, for example, is more similar to the Y chromosome found in living humans than it is to the rest of the Neanderthal genome.

In 2020, researchers offered an explanation: Neanderthal males inherited a new Y chromosome from humans between 370,000 and 100,000 years ago. But that would have made sense only if a wave of Africans had expanded out of the continent much earlier than scientists had thought.

Researchers have recently found evidence for such an early wave in the genomes of living Africans.

Dr. Tishkoff and her colleagues compared the genome of a 122,000-year-old Neanderthal fossil with the genomes of 180 people from 12 populations across Africa. Previous studies had found no sign of Neanderthal DNA in African genomes. But Dr. Tishkoff’s group detected tiny pieces of Neanderthal-like DNA scattered across all 12 of the populations they studied.

When they examined the size and sequence of those genetic fragments, they concluded that Neanderthals inherited them from early Africans. That meant an early wave of Africans expanded into Europe or Asia about 250,000 years ago and interbred with Neanderthals.

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Posted: May 30, 2024 - 12:22pm

Scientists generate the first complete chromosome sequences from non-human primates
Complete X and Y chromosome sequences from six primate species reveal species diversity and insights into evolution.
A team of researchers funded by the National Institutes of Health have generated the first complete chromosome sequences from non-human primates. Published in Nature, these sequences uncover remarkable variation between the Y chromosomes of different species, showing rapid evolution, in addition to revealing previously unstudied regions of great ape genomes. Since these primate species are the closest living relatives to humans, the new sequences can provide insights into human evolution.

The researchers focused on the X and Y chromosomes, which play roles in sexual development and fertility, among many other biological functions. They sequenced chromosomes from five great ape species, chimpanzee, bonobo, gorilla and Bornean and Sumatran orangutans, as well as one other primate species that is more distantly related to humans, the siamang gibbon. (...)

The researchers found that over 90% of the ape X chromosome sequences aligned to the human X chromosome, showing that the X chromosomes have remained relatively unchanged over millions of years of evolution. However, only 14% to 27% of the ape Y chromosome sequences aligned to the human Y chromosome. (...)

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Posted: Feb 2, 2023 - 5:29pm

Meet the man who has transformed our understanding of evolution
The Royal Swedish Academy of Sciences has awarded the Canadian evolutionary biologist Dolph Schluter the prestigious Crafoord Prize for his work on the mechanics of evolution, which has fundamentally changed our understanding of how the tree of life branches out.
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Posted: Oct 19, 2022 - 6:54am

 miamizsun wrote:

some get stoned
some get strange
sooner or later we all walk on




What's that AI smokin'?
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Posted: Oct 19, 2022 - 6:11am

some get stoned
some get strange
sooner or later we all walk on


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Posted: Oct 3, 2022 - 12:18pm

The Nobel Prize in Physiology or Medicine was awarded to Svante Pääbo on Monday for his discoveries concerning the genomes of extinct hominids and human evolution. (...)

“Through his pioneering research, Svante Pääbo — this year’s Nobel Prize laureate in physiology or medicine — accomplished something seemingly impossible: sequencing the genome of the Neanderthal, an extinct relative of present-day humans,” the Nobel committee said in a statement.

“Pääbo’s discoveries have generated new understanding of our evolutionary history,” the statement said, adding that this research had helped establish the burgeoning science of “paleogenomics,” or the study of genetic material from ancient pathogens.

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Posted: Jun 1, 2022 - 9:45pm

How Much Do Your Genes Shape Your Politics? *
They’re not everything, but they’re not nothing, either.
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Posted: Feb 7, 2022 - 2:03pm

Meet the man who can explain the first 3 billion years of life on our planet
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Posted: Jan 24, 2022 - 2:11pm

Omicron’s Radical Evolution*
Thirteen of Omicron’s mutations should have hurt the variant’s chances of survival. Instead, they worked together to make it thrive.
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Posted: Jan 3, 2022 - 6:15pm


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Posted: Dec 30, 2021 - 6:09pm

Most Detailed Tree of Life Ever Made That You Can Actually Explore!

www.onezoom.org

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Posted: Nov 4, 2021 - 5:57am

 rgio wrote:
 miamizsun wrote:

These Mice Pups Inherited Immunity From Their Parents—But Not Through DNA

The rules of inheritance are supposedly easy. Dad’s DNA mixes with mom’s to generate a new combination. Over time, random mutations will give some individuals better adaptability to the environment. The mutations are selected through generations, and the species becomes stronger.
much more


Good morning indeed...I'm already exhausted reading this... So...let's just say they're right, and that the same thing happens in humans.  Then, let's assume in a few generations, a really nasty form of COVID comes along, and only those who have been vaccinating (grandparents, parents, individuals) will have the trained epigenetic coding to respond to the "really bad strain"... is it possible we could "breed out" the anti-vaccers?   Kids...pick your reproductive partners well!
 
the precise answer is definitely possibly maybe
or theoretically it looks like it if we squint a bit (of course the original article is behind a paywall)
seriously, we're finding out more and more regarding epigenetics
short answer is that we have a lot of code/dna and we pass it on
that code has an on/off function
it looks like that certain immune code that gets turned on can be passed on to offspring in the on position
biotech is in the early stages of exponential-like discovery
writing or modifying biological code has huge potential
we'll see what happens and where it goes..
i encourage people to use a platform like twitter to aggregate this type of news
most of these companies have a feed to glean for their projects


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Posted: Nov 4, 2021 - 5:12am

 miamizsun wrote:

These Mice Pups Inherited Immunity From Their Parents—But Not Through DNA

The rules of inheritance are supposedly easy. Dad’s DNA mixes with mom’s to generate a new combination. Over time, random mutations will give some individuals better adaptability to the environment. The mutations are selected through generations, and the species becomes stronger.
much more



Good morning indeed...I'm already exhausted reading this...

So...let's just say they're right, and that the same thing happens in humans.  Then, let's assume in a few generations, a really nasty form of COVID comes along, and only those who have been vaccinating (grandparents, parents, individuals) will have the trained epigenetic coding to respond to the "really bad strain"... is it possible we could "breed out" the anti-vaccers?  

Kids...pick your reproductive partners well!
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Posted: Nov 4, 2021 - 4:55am

These Mice Pups Inherited Immunity From Their Parents—But Not Through DNA

The rules of inheritance are supposedly easy. Dad’s DNA mixes with mom’s to generate a new combination. Over time, random mutations will give some individuals better adaptability to the environment. The mutations are selected through generations, and the species becomes stronger.

But what if that central dogma is only part of the picture?

A new study in Nature Immunology is ruffling feathers in that it re-contextualizes evolution. Mice infected with a non-lethal dose of bacteria, once recovered, can pass on a turbo-boosted immune system to their kids and grandkids—all without changing any DNA sequences. The trick seems to be epigenetic changes—that is, how genes are turned on or off—in their sperm. In other words, compared to millennia of evolution, there’s a faster route for a species to thrive. For any individual, it’s possible to gain survivability and adaptability in a single lifetime, and those changes can be passed on to offspring.

“We wanted to test if we could observe the inheritance of some traits to subsequent generations, let’s say independent of natural selection,” said study author Dr. Jorge Dominguez-Andres at Radboud University Nijmegen Centre.

“The existence of epigenetic heredity is of paramount biological relevance, but the extent to which it happens in mammals remains largely unknown,” said Drs. Paola de Candia at the IRCCS MultiMedica, Milan, and Giuseppe Matarese at the Treg Cell Lab, Dipartimento di Medicina Molecolare e Biotecnologie Mediche at the Università degli Studi di Napoli in Naples, who were not involved in the study. “Their work is a big conceptual leap.”

much more

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Posted: Sep 28, 2021 - 6:25pm

How Humans Lost Their Tails
A new study suggests that a single genetic mutation helps explain why monkeys have tails, while apes and people do not.
For half a billion years or so, our ancestors sprouted tails. As fish, they used their tails to swim through the Cambrian seas. Much later, when they evolved into primates, their tails helped them stay balanced as they raced from branch to branch through Eocene jungles. But then, roughly 25 million years ago, the tails disappeared.

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Posted: Aug 17, 2021 - 7:00pm

 miamizsun wrote:




Amon Tobin is pretty awesome. I've always liked his music and experimental sound.
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Posted: Aug 17, 2021 - 5:51pm


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Posted: Jun 16, 2021 - 9:56am

The Longest-Running Evolution Experiment

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Posted: Apr 19, 2021 - 10:31am

How Many Tyrannosaurus Rexes Ever Lived on Earth? Here’s a New Clue.
An estimation of the iconic predator’s total population can teach us things about dinosaurs that fossils cannot.
For living species, John Damuth, a biologist at the University of California, Santa Barbara, came up with a mathematical relationship, now known as Damuth’s law, between the average body mass of an animal and its expected population density.

The relationship is not universal but generally holds for large classes of animals like lizards or meat-eating mammals. So, for Tyrannosaurus rex, they had to not only plug in the weight of the dinosaur — about six tons, give or take a few — but also derive other numbers in the law.

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Posted: Mar 30, 2021 - 10:49am

Alien Languages May Not Be Entirely Alien to Us
Evolution should favor some universal traits in the emergence of any form of communication on any planet
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