Somali Founder Effect & Genetic Diversity

[BetterDaysAhead]

It seems that the average Somali is more inbred than the product of a normal second cousin marriage, and FROH (measure of inbreeding) of 0.015 for children of second cousins and a higher higher 0.018 for the average Somali. This is apparently due to present day preference for consanguineous marriage among Somali because we have many long runs of homozygous DNA. Very shocking news to me because inbreeding lower intelligence by quite a lot. Children of first cousin marriages have iqs about 10 points lower than average. Our neighbors the Oromo and and Amhara have extremely low rates of inbreeding by world standards.

Somalis being a small ethnic group originally does not explain this outcome btw.
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The 52.28 number is how many long runs of homozygosity (more than 1.5 Megabases) the average Somali has. Compare this figure to the Amhara and Oromo at 7.55 and 9.7.

The average Somalia has an FROH (measure of inbreeding) of 0.018 which is higher than children of second cousins, while the Amhara have levels 7x lower and the Oromo about 5.5x lower.

Almost half of all Somalis, 48.7%, are products of either first cousin marriage or second cousin marriage. Compare this to 0% of Oromo and Amhara!
This statistic blew my mind.

Source: https://sci-hub.tw/10.1007/s00439-019-02045-1

Runs of homozygosity in sub-Saharan African populations provide insights into complex demographic histories - Human Genetics

The study of runs of homozygosity (ROH) can shed light on population demographic history and cultural practices. We present a fine-scale ROH analysis of 1679 individuals from 28 sub-Saharan African (SSA) populations along with 1384 individuals from 17 worldwide populations. Using high-density...

link.springer.com

What if they got the amhara and oromo samples from the ones from major cities and towns and the Somali samples from the ones from rural isolated villages? This could explain the staggering difference

 

[Shmurda]

Nah thats nasty.. how can u marry ur own cousin i know its allowed but its disgusting

Who's talking about marrying? I wanna pump and dump my sexy cousin not marry her.

 

[Fay]

Who's talking about marrying? I wanna pump and dump my sexy cousin not marry her.

Thats nasty man.. But to each its own

 

[Ace the shank]

The average Somali is genetically a product of second cousin marriage. If you keep marrying within your subclan, generation after generation, you will accrue enough homozygosity within that subclan such that any child from a marriage within that subclan is genetically inbred to a similar degree as the offspring of a second cousin marriage of unrelated people. Also keep in mind that first cousin marriage raises the FROH 4x more than a second cousin marriage. Many Somalis marry their first cousin.

That is bs majority Somalis I’ve met are from two different qabil including me my mom is from the north and my dad is from the south but if you gonna look at inbred people I would say Arabs,Pakistanis and Afghans are known to marry first cousin

 

[embarassing]

That is bs majority Somalis I’ve met are from two different qabil including me my mom is from the north and my dad is from the south but if you gonna look at inbred people I would say Arabs,Pakistanis and Afghans are known to marry first cousin

There are Somalis from baadiyaha/rural who probably dont meet people from other regions and marry from the people around them who are likely their subsubsub clan or w.e.

 

[Ace the shank]

There are Somalis from baadiyaha/rural who probably dont meet people from other regions and marry from the people around them who are likely their subsubsub clan or w.e.

Ik that but that’s back home majority of Somalis in the diaspora and Somalis back home in the cities marry from outside their clans

 

[embarassing]

Ik that but that’s back home majority of Somalis in the diaspora and Somalis back home in the cities marry from outside their clans

The study wasn't done on them.

 

[BetterDaysAhead]

But still Somalis are known to be one of the most ugliest people on this earth

We’re known for our beauty bro idk what you’re talking about

 

[BetterDaysAhead]

That’s only the women sxb you always ajanabi guys with xalimos you never see faraxs with ajanabi girl that’s because no one wants us

 

[Ace the shank]

See at least she agree with me

 

[embarassing]

Am I what

lol a man or woman?

all your posts are very feminine, obsessed about mens looks and being mixed.

 

[BetterDaysAhead]

See at least she agree with me

She? I’m refuting your claim sxb

 

[Ace the shank]

lol a man or woman?

all your posts are very feminine, obsessed about looks and being mixed.

I’m feminine because I’m obsessed with looks wow okay you one blind ass nigga look at my dp and tell me if I’m a male or female and stop asking me some dumb ass questions

 

[Ace the shank]

She? I’m refuting your claim sxb

good for you

 

[BetterDaysAhead]

good for you

Good for you as well warya get you an ajnabi from Cameroon

 

[Halimak]

How is that possible when historically, we used to avoid cousin marriages?

 

[BetterDaysAhead]

How is that possible when historically, we used to avoid cousin marriages?

This study used samples of somalis most likely from rural and isolate parts of somali galbeed with many ancestors that married within subclans it’s not representative of all somalis

 

[Halimak]

This study used samples of somalis most likely from rural and isolate parts of somali galbeed with many ancestors that married within subclans it’s not representative of all somalis

Everywhere you go in the world, people that live in rural areas tend to be inbred. I can imagine, if they did a study of Americans that live in small towns in the deep south, you would find they are very inbred. Americans already crack jokes about hillbillys marrying their cousins and being dumb.

 

[Apollo]

The inbred premise is misleading, I don't think Somalis are inbred in the true sense of the word. They merely descend from a small founding population (mentioned before here 'effective population size'). Bad choice of wording @Thegoodshepherd especially since how prone SomaliSpotters are at misinterpreting data.

Lastly, that is not an extensive list of Sub-Saharan Africa, only a handful of groups, so the claim ''the most'' is also dubious. The Rendille, Beja, Afar and many other smaller groups would easily beat Somalis collectively in that measurement.

 

[Apollo]

Source:

Genomic Runs of Homozygosity Record Population History and Consanguinity

The human genome is characterised by many runs of homozygous genotypes, where identical haplotypes were inherited from each parent. The length of each run is determined partly by the number of generations since the common ancestor: offspring of cousin marriages have long runs of homozygosity...

journals.plos.org

Most of the world has ROH Mb lenght of 50+, making Somalis with their 52 ROH Mb totally unremarkable and not inbred by global standards.

It's just that other Sub-Saharan Africans are odd with their very low ROH mb length.