In fact, some combination of these explanations is likely, the researchers said.
Still, it's hard to untangle whether there's a causal link between inbreeding and producing more children, Bailey said.
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The non-foraging societies included horticulturalists, agriculturalists and herding populations, whereas foraging societies were primarily hunter-gatherers.
The researchers defined fitness as the number of surviving children in the family tree.
I can't find anything in the Bible about this subject, but we are taught that it is not right to date your family.
I am having a problem with this because my child is dating my 3rd cousin, and in my heart I feel it is wrong. The following verses in Leviticus eighteen give a list of those who are too close of kin to marry.
Marrying a cousin is usually considered a bad idea, because inbreeding can lead to harmful genetic conditions.
But paradoxically, in some societies, marrying a related spouse is linked to having more surviving children, research suggests.Also, because marriages between two closely related individuals are rare in hunter-gatherer societies, the study was based on a small sample, which could have skewed the results.Tanya has been writing for Live Science since 2013.Pairing with close kin is known to reduce genetic diversity, which can result in the accumulation of severe and sometimes lethal mutations.For example, groups that commonly practiced intermarriage between relatives, like the British monarchy, had children with all sorts of nasty genetic problems.But from what you tell me about this situation, it is far from the biblical warning.