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In this setting, the family unit is based around a clan system. An individual's wealth and status is related to the clan they are born in, and it's ancestry is based on matrilineal lines. Due to certain environmental factors on the continent, travel between regional areas can be somewhat difficult and expensive. Therefore, most breeding takes place between clans in relative proximity of each other.

Marriage does not exist in the form we would recognize. Women remain in the clan they were born into, while men are the ones who leave the home to join other families. Men dont marry an individual, but marries into an entire clan. This leads to many offspring coming from the same group of fathers. A cultural belief system has developed in which boys are considered "sons of society" and raised in bulk while girls are "daughters of their mothers" and raised specifically by their mother.

How can this society avoid genetic inbreeding under these circumstances?

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  • $\begingroup$ Are there multiple men at a time in a clan ? $\endgroup$ – Jean-Abdel Sep 15 '18 at 21:06
  • $\begingroup$ On a random side-note: I find the base idea pretty cool. The "sons of society" and "daugthers of their mothers" thing. Interesting concept. $\endgroup$ – ArtificialSoul Sep 17 '18 at 9:38
  • $\begingroup$ Also, see ring species. At least the culture of your people will evolve this way even stronger than most real-world examples. $\endgroup$ – hajef yesterday
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The answer is in the question itself:

Women remain in the clan they were born into, while men are the ones who leave the home to join other families.

Humans are an XY sex determination species. So when a man joins a clan, he brings not only his Y chromossome - he also brings a X which adds variety to the the pool of X chromossomes in the matriarchy.

To improve genetic variation, you need to change the man who is fathering children every once in a while. You can either have a clan marry multiple men at the same time, or have marriages be temporary.

The animal I can think of with the behavior that most closely matches that are african elephants, and as a species they've managed it (until we started hunting them). Males don't stay with a band for long after they become adults. They will rover around alone or in small bands of males. When the females of a clan are in heat, a male will mate with them and then leave.

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How can this society avoid genetic inbreeding under these circumstances?

This has happened even when travel is relatively easy throughout our history.

Inbreeding is mitigated against in a few ways.

With matrilineal societies ambitious men have few ways to upgrade their social status, and some will be displaced. Some of these will travel and spread genes. If there is conflict you may get mass displacement.

A lot would depend on whether their is any restriction on marrying outsiders whether outside the clan, region etc,. But with a large enough demographic you are unlikely to get dangerous inbreeding, human cultures have always culturally protected against that in broad strokes by various taboos unless under extreme pressure. So while you get regional traits coming from shared ancestry with a few exceptions like royalty who want to keep power within families you don't really have any danger of it getting dangerous unless the communities are totally isolated like Islands.

Humans have experienced several population bottlenecks with at least one being estimated at as few as 600 breeding pairs Worldwide, yet from that we have the huge diversity we have now. You don't need a huge influx of new blood every year, just a small intermittent supply of travelers would be fine and cultural taboos against close relatives getting too frisky.

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  • $\begingroup$ Matrilineal societies are not matriarchies, and are often run by the men. There would be ways for men to advance, although having the right mother would probably be a real help (the father doesn't matter). $\endgroup$ – David Thornley Sep 15 '18 at 19:10
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    $\begingroup$ @DavidThornley Even Matriarchies have been run by men, I don't see your point With matrilinieal societies the mothers brothers are the usual male power. But in the OP's question this will not happen as the males go to live elsewhere, so her brothers will not be around, they'll lose that status as soon as they get married. Not only is the op talking matrilineal, but matrilocal, makes a big difference. Advancing would mainly depend on marriage, there is a finite supply of high status women, some places this was mitigated by polyandry (multiple husbands) but the OP didn't say that. $\endgroup$ – Kilisi Sep 15 '18 at 19:17
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    $\begingroup$ No culture would allow the mothers brothers to retain that status unless they forbid them to marry within the group, because otherwise a queens brothers wives, would outrank her. If they're forced to marry outside the group if they even want to retain any status at let alone advance. Some Polynesian and Melanesian, unsure on Micronesian had this problem to the point where certain people were so highly ranked there were no possible partners without breaking tapu. If they're forbidden to marry within the group, there is your gene flow solution right there. $\endgroup$ – Kilisi Sep 15 '18 at 19:26
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Sperm peddlars.

This exists now, for people who raise animals.

https://www.swinegenetics.com

Swine Genetics International is an artificial insemination swine genetics company, also offering swine production related consulting.

Liquid semen is available from over 150 sires to help you meet your genetic needs. Boars representing the following commercial lines are housed at SGI: Purebred, Exotic, Terminal, Maternal, Meat Quality and Certified "Niche" Program animals. We also offer 40 sires that comprise our showpig program. Frozen semen is available on boars housed at SGI since 1981 - including sires currently on stud. SGI is very active in exporting both swine semen and live animals all over the world. Our current staff provides artificial insemination and production-related consultation for swine operations globally.

In your world, magic allows preservation of semen. The sperm peddlar comes around once or twice a year, when it is optimal to conceive. Her wares (and it will be her, because magic is involved) will have information about the sire and children he has produced.

I envision her arriving in a gypsy wagon. Travel is hard, but she knows ways and has skills. When she arrives, she can help with the whole process. If there are males in the village she might make some purchases as well.

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Due to certain environmental factors on the continent, travel between regional areas can be somewhat difficult and expensive.

Travel anyway. Do it in groups -- a traveling "meat market" where the men show themselves off in hopes of being chosen by the clan with the prettiest women -- during the the least-unfavorable time of the year.

A man doesn't marry an individual, but marries into an entire clan. This leads to many offspring coming from the same father.

There's a reason that most cultures are monogamous: polygamy leads to a lot of unmarried men with no sexual outlet, and that leads to violence (including rape).

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  • $\begingroup$ Actually there are several matrilinear cumtures like the Hopis and there isn't more rape in these. $\endgroup$ – Jean-Abdel Sep 15 '18 at 15:04
  • $\begingroup$ @Jean-Abdel the answer specifically stated that polygamy is the problem, not matrilineality. $\endgroup$ – RonJohn Sep 15 '18 at 19:53
  • $\begingroup$ Matrilineal is often Polygamous since there is no marriage and nobody needs to know who's the father. $\endgroup$ – Jean-Abdel Sep 15 '18 at 19:58
  • $\begingroup$ @Jean-Abdel polygamy where "nobody needs to know who's the father" requires multiple men. The question specifies one man. $\endgroup$ – RonJohn Sep 15 '18 at 20:02
  • $\begingroup$ I don't think there would be one men at a time in a clan $\endgroup$ – Jean-Abdel Sep 15 '18 at 20:48

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