The Ancestor Paradox

I understood nothing

The bit about the number of ancestors a sexual organsim effectively inherits genes from decreasing as you look back across many generations is called "Coalescent Theory", and ends up allowing us to figure out a surprising amount of stuff in population biology

You’re very likely your own 5th cousin…

That doesn't account for gene recombination though. Does the math still work then?

So the question everybody asks about all the inbreeding right after Adam and Eve was more accurate than we dared to think :3c

You were good at debunking the "everyone European has the same shared ancestors because of the numbers involved", some cousin marrying from 1st to 5th brings the astronomical numbers down.

But DNA is not passed on randomly, it can come in related sections, this is how you can identify distant ancestors from thousands of years ago.

DNA inheritance is more structured than just random shuffling. Segments of DNA are inherited in blocks. During reproduction, chromosomes from the mother and father are shuffled and passed on to their offspring in chunks. These blocks of DNA, often known as haplotypes, can be traced back to common ancestors.

By examining these inherited sections someone can identify connections with distant relatives and uncover fascinating insights into their family history. Through this, people can sometimes even trace back to specific ancestral regions and lineages. It's a powerful tool for unlocking the stories of heritage.

Middle East

Ancient sweet home alabama

Oh, I think they fork plenty. IF YOU KNOW WHAT I MEAN.

Turn the pyramid around and it will make a lot more sense 😄

Remember that family have mpre than 1 kid so... do so math and we allmost solve problem

i LOVE THIS VIDEO, BUT i FEEL LIKE i NEED TO WEAR SUNGLASSES BECAUSE IT'S ALL WHITE.

"Your gene pool might be smaller than you think." Especially if you live in the deep south!

no matter who you are, if you trace your DNA back far enough, there will be evident of inbreeding.... people used to live in small population and thing like plague can wipe out if not the whole tribe, majority of the tribe..

Even barring all the really horrific reasons we have shared ancestors... Back in the days before people frequently moved more than 5 miles from where they were born, you had to figure that you shared a few ancestors with your spouses/lovers. I like how the video called it a limited dating pool, because... yeah. That's how you get genetic bottlenecks

I would love to hear an elaboration on this in relation to Blue Eyes, and Red Hair.

And it all started from 2 people.

Heh, was bout to sub, though it seems your channel doesn't like the jokes in the comments that you make in your vid. boooooo- so, no sub/blocked.

Gensis Khan doesn't have any worries. His blood is still strong!

Turns out there's a reason we HAD TO develop incest taboos.

My grandfather was from a small village in southern Spain, and when you look into his family tree it’s full of marriages between people in his village and the 2 villages closest to it lol it doesn’t take long till you get double last names (in Spain every kid inherits their mothers and their fathers last name, so with double last name I mean having the same last name twice, like being called Joe Smith Smith). Unless you lived in a large city, most people had very very limited dating pools for most of history

Sure as hell not getting a DNA test from an Israeli company, one that can't even do such tests in Israel (for obvious but lied about, reasons).

You indicated that one may only have a 3% chance of receiving a gene from an ancestor 15 generations back and as you put it almost zero percent going back further, didn't those ancestors at the 3% receive 100% of their genes from previous generations? I am confused.

I have ancestry from every inhabited continent except Australia and married a woman from a foreign country, so my kids are mildly less inbred than most of their friends. Winning!

kkkkkk, cara, assim, já nos primeiros 25 segundos de vídeo, eu vi que esse vídeo não era p mim... onde os meus pais são primos e dos meus 4 avós, 3 são primos... kkkk, eu não tenho tantos ancestrais assim.

The ancestry website is going to be useless for me because most of my relatives are in China 🇨🇳 and it’s really just me and my parents and my mom’s 2 cousins and their immediate families who are overseas 🇺🇸.

I actually went back to China 🇨🇳 recently and the main purpose was to visit living relatives and decreased relatives. And I got access to my dad’s side of the family stuff. They have recorded a lot. 😅 My mom’s side is more of a mystery.

Cousins are tons of fun.

The southern states still prefer siblings or parents.

Hi, cousin!



Wait, since incest is illegal, technically it's illegal to continue humanity.

Guess I shouldn't have expected much from a 4-minute video... All I got was this lousy headache, trying to scramble around in my attic, to figure whether or not this guy's math did compute. I never figured it out, if you're curious.

Oh yeah, that ol’ Habsburg chin. They kept it in the family to keep that feature going strong.

In Algeria abetted not family is from, marrying first cousins is still very common to the point that they make jokes about it. 🤷

This is why the people who claim that “Modern Jews aren’t from Israel because the majority of their DNA is European” are completely wrong. Like yeah, but DNA only provides an accurate indicator so far back. Of COURSE a people who have been exiled to Europe for literal millennia have very little genetics in common with people who weren’t. There are things about Israel to criticize, but this is basically picking up where N@zi genetic classification pseudoscience left off.

The whole concept of evolution is that newer genes better serve an individual than older genes.

My heritage not only did nothing for me, they stole money from me, I don't recommend

You can look-up Maternal Lineage Extinction Ratio (MLER) and Paternal Lineage Extinction Ratio (PLER).
This concept explains why the so-called 'Eve Hypothesis' is not only true, but it's precisely inevitable.
If you've not heard of these ideas, don't feel too bad. Even some paleoanthropologists haven't yet hoisted them aboard. They're still making up overly complicated stories.

No paradox here.

My sister is something like 33-37% Eastern European Jew, and my mother was 5050. My sister has more than the 25% of our grandfathers genes from a naive 25/25/25/25 from grandparents, but it's pretty simple when you think about how high the deviation is when you're getting only 23 half-pairs of chromosomes from your parents.

Okay so did you make the generation graph purposefully look like upside down male genitalia? Lol

Tldr. Incest

Um, yeah. There IS NO WAY there has been 117 billion people ever. There was only around 2 billion people on the planet during WW1 a century ago. Humans have only been on the earth for 6000 years. The earth is obviously much older. But there’s just no way you could have that many humans alive going back 6000 years.

I still don’t understand this because you say we don’t inherent genes from our far out ancestors, but our closer ancestors did inherit those genes and we inherited theirs. So in a way didn’t our very distant ancestors influence our own genetics?

Fork your tree