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Thread: Relationship between Y-chromosomal DNA haplogroups and sperm count (fertility)?

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    Relationship between Y-chromosomal DNA haplogroups and sperm count (fertility)?

    I can't help but think there is definitely a correlation. I've noticed R1b clades tend to have the same (or very close) TMRCA as the clade formation, most of the time. E.g:

    R-U106 Formed 4800 ybp, TMRCA 4700 ybp

    R-DF27 formed 4500 ybp, TMRCA 4500 ybp

    R-U152 formed 4500 ybp, TMRCA 4400 ybp

    R-L238 formed 4500 ybp, TMRCA 4400 ybp

    R-DF19 formed 4500 ybp, TMRCA 4500 ybp

    R-Z2118 formed 5700 ybp, TMRCA 5100 ybp

    R-Y8452 formed 7400 ybp, TMRCA 7400 ybp

    R-Z2103 formed 6100 ybp, TMRCA 5500 ybp

    This certainly points to something. Not only these clades, but many R1b and especially R-M269 clades are like this except for, ironically, R-M269. Meanwhile when we take look at haplogroups like L for example:

    L-M349 formed 12700 ybp, TMRCA 7500 ybp

    L-Y31183 formed 7500 ybp, TMRCA 1250 ybp

    L-PAGE116 formed 6400 ybp, TMRCA 325 ybp

    L-Y31947 formed 8100 ybp, TMRCA 6000 ybp

    L-Y16187 formed 9300 ybp, TMRCA 2900 ybp

    L-L1307 formed 17000 ybp, TMRCA 7900 ybp

    L-M27 formed 17000 ybp, TMRCA 8100 ybp

    See? Now perhaps this may be due to "population bottle necks" or "founder effect" in the populations or many other reasons, but this was also detected in Italy for example, and this is not to be determined for R1b and L alone:

    https://www.researchgate.net/publica...count_in_Italy
    Last edited by Moe12; 04-21-2019 at 01:02 PM.

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    If not fertility, per se, maybe sex drive, or the ability to produce offspring well past what we think is someone's prime. I have often wondered about this myself.

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     Moe12 (04-23-2019)

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    It doesn't really make sense if you think about it though. It would mean at the time everyone had the potential to have tons of kids but all the non-R1b men were so infertile that they only had a few.

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    Quote Originally Posted by Megalophias View Post
    It doesn't really make sense if you think about it though. It would mean at the time everyone had the potential to have tons of kids but all the non-R1b men were so infertile that they only had a few.
    I didn't say it's necessarily linked to R1b exclusively. But more to dominant and common haplogroups notably R1b, R1a, J1, J2 and O. It might be just certain bottlenecks which I lean on to believe and it sounds more rational to be honest. But who am I to say.
    Last edited by Moe12; 04-23-2019 at 08:12 PM.

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    Cool thread. It could be that certain haplos confer certain advantages, reproductive or otherwise. For example, mito haplo H is more resistant to sepsis.Could be that R1b 269 is associated with more testosterone and were more war like. Or maybe R1/EHG is less domesticated than the European farmers, since they became pastoralists late in the game. HG societies have higher homicide rates than settled societies, unless this has been debunked? Larger social groups evolved to be less aggressive, as you have to get along with people who arent close kin. It would be cool to figure out what caused the WHG bounce back, and how haplotype I replaced G in neolithic Northern Europe.
    You got the wrong number, can I take a message?

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