# Silly blood type question

**URL:** <https://boards.straightdope.com/t/silly-blood-type-question/582567>\
**Category:** Factual Questions\
**Created:** [May 20, 2011, 2:47pm UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567 "2011-05-20T14:47:40Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![SemperI](https://avatars.discourse-cdn.com/v4/letter/s/eb8c5e/32.png) [@SemperI](https://boards.straightdope.com/u/SemperI)\
**Post date:** [May 20, 2011, 2:47pm UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567/1 "2011-05-20T14:47:40Z")

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I know this is a weird question, but indulge me. I’m a caucasian with a B blood type. Do I have a mongolian ancestor?

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**Author:** ![constanze](https://avatars.discourse-cdn.com/v4/letter/c/f9ae1b/32.png) [@constanze](https://boards.straightdope.com/u/constanze)\
**Post date:** [May 20, 2011, 4:51pm UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567/2 "2011-05-20T16:51:27Z")

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How far back do you want to go? You also have an African ancestor, esp. if you’re[female](http://en.wikipedia.org/wiki/Mitochondrial_Eve) or even if you’re [male](http://en.wikipedia.org/wiki/Y-chromosomal_Adam).

I assume you’re refering to the[hypothesis](http://en.wikipedia.org/wiki/ABO_blood_group_system#Distribution_and_evolutionary_history) that different blood groups evolved at different times in different locations? Well, if you look at[that table](http://en.wikipedia.org/wiki/ABO_blood_group_system#ABO_and_Rh_distribution_by_country), there is a good distribution of all factors in most countries, so even if the B blood type originally came from Asia, that’s thousands of generations ago. Good luck finding that ancestor.

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**Author:** ![Smeghead](https://avatars.discourse-cdn.com/v4/letter/s/f1d935/32.png) [@Smeghead](https://boards.straightdope.com/u/Smeghead)\
**Post date:** [May 21, 2011, 12:41am UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567/3 "2011-05-21T00:41:08Z")

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Insufficient data from which to draw a meaningful conclusion.

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**Author:** ![EvilTOJ](https://avatars.discourse-cdn.com/v4/letter/e/ee59a6/32.png) [@EvilTOJ](https://boards.straightdope.com/u/EvilTOJ)\
**Post date:** [May 21, 2011, 1:51pm UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567/4 "2011-05-21T13:51:05Z")

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Do you have a pronounced stoutness of the tum and a predilition for little fur hats? Is your brain filled with a thousand hairy horsemen all shouting at you?

If not, you probably don’t have any Mongolian ancestry.

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**Author:** ![Colibri](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/colibri/32/1841_2.png) [@Colibri](https://boards.straightdope.com/u/Colibri)\
**Post date:** [May 21, 2011, 6:12pm UTC](https://boards.straightdope.com/t/silly-blood-type-question/582567/5 "2011-05-21T18:12:31Z")

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> [@SemperI](#):
>
> I know this is a weird question, but indulge me. I’m a caucasian with a B blood type. Do I have a mongolian ancestor?

Going back a few thousand years, you almost certainly have at least a few Mongolians among your thousands of ancestors, regardless of your blood type. Nearly all Europeans do. However, whether this has left any identifiable markers in your genome is a matter of chance.