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posted by martyb on Tuesday September 14 2021, @04:04PM   Printer-friendly
from the opposites-attract? dept.

Prehistoric humans rarely mated with their cousins:

At present-day, more than ten percent of all global marriages occur among first or second cousins. While cousin-marriages are common practice in some societies, unions between close relatives are discouraged in others. In a new study, researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and the University of Chicago investigated how common close parental relatedness was in our ancestors.

The researchers re-analyzed previously published DNA data from ancient humans that lived during the last 45,000 years to find out how closely related their parents were. The results were surprising: Ancient humans rarely chose their cousins as mates. In a global dataset of 1,785 individuals only 54, that is, about three percent, show the typical signs of their parents being cousins. Those 54 did not cluster in space or time, showing that cousin matings were sporadic events in the studied ancient populations. Notably, even for hunter-gatherers who lived more than 10,000 years ago, unions between cousins were the exception.

To analyze such a large dataset, the researchers developed a new computational tool to screen ancient DNA for parental relatedness. It detects long stretches of DNA that are identical in the two DNA copies, one inherited from the mother and one from the father. The closer the parents are related, the longer and more abundant such identical segments are. For modern DNA data, computational methods can identify these stretches with ease. However, the quality of DNA from bones that are thousands of years old is, in most cases, too low to apply these methods. Thus, the new method fills the gaps in the ancient genomes by leveraging modern high-quality DNA data.

Journal Reference:
Harald Ringbauer, John Novembre, Matthias Steinrücken. Parental relatedness through time revealed by runs of homozygosity in ancient DNA [open], Nature Communications (DOI: 10.1038/s41467-021-25289-w)


Original Submission

 
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  • (Score: 3, Informative) by maxwell demon on Tuesday September 14 2021, @05:52PM (2 children)

    by maxwell demon (1608) on Tuesday September 14 2021, @05:52PM (#1177776) Journal

    Well, if you forcefully take your mates from the next tribe, it's probably not a cousin.

    --
    The Tao of math: The numbers you can count are not the real numbers.
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  • (Score: 2) by crb3 on Tuesday September 14 2021, @06:49PM (1 child)

    by crb3 (5919) on Tuesday September 14 2021, @06:49PM (#1177793)

    Unless your tribe keeps doing that.

    • (Score: 1, Insightful) by Anonymous Coward on Tuesday September 14 2021, @08:11PM

      by Anonymous Coward on Tuesday September 14 2021, @08:11PM (#1177833)

      Or, better, your tribes take turns. One from you. Next, one from them. Eventually the two tribes are bound to have cousin-cousin mating.