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Thread: On gene-groupings and sexual dimorphism?

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    Junior Member Kalki's Avatar
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    Default On gene-groupings and sexual dimorphism?

    I have Come to notice women often showcase stronger phenotypical traits in certain groups. At least where I live in Norway, I notice a lot of women have extremely light blonde hair naturally, while blonde men either have the ashy-white blonde or golden-blonde variants. Both considderably darker in appearance than the typical female of either group.

    Btw I have also noticed a strong relation between ashy-white hair and dark-blue eyes + very White skin, and golden hair and light blue eyes and a slight golden hue in the skin. Are these genes connected somehow in the same way red hair and green eyes are, or red hair, Green eyes and slightly red-freckled skin?

    I suppose I have been thinking that maybe women appear more light-blonde because their hair is simply longer and the roots are always darkest, but Im not sure tbh.

    And I had an idea that either these gene-groupings affect eachother and are directly grouped mechanically, OR these might be old tribal distributions in Norway that live on because of little movement of population.



    What do you think?

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    Quote Originally Posted by Kalki View Post
    maybe women appear more light-blonde
    I think that in every phenotype women are lighter on average than men. But men showcase stronger phenotypical traits when it comes to head and face shape.

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    Junior Member Kalki's Avatar
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    Alternatively, could these gene-groupings be related to population-waves from ancient times perhaps? I have noticed, just anecdotally, that the ash-blonde, dark blue eyed peoples have some What pear-shaped skulls seen from above, with the forehead being the narrowest section, and the back of the head being a little flater than the golden-blonde variant.

    I believe Fridtjof Nansen would be a great example of the ash-blonde phenotype, while Helmut von Moltke would be a great example of the golden-blonde variant

    fridtjof-nansen.jpg

    220px-Helmuth_Karl_Bernhard_von_Moltke.jpg

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    Junior Member Kalki's Avatar
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    Interestingly enough, I have noticed this disparity. It's increadibly hard to find any good examples of dolichocephalic females imo. Often the hair makes them appear Long-headed or high-vaulted while in reality they are not...

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    Females are usually in sub-dolico or sub-brachy categories.

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    Junior Member Kalki's Avatar
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    Any ideas about the gene-groupings? What causes them? Are there any other groups/cluster of genes that heavily correlate?

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    Junior Member Kalki's Avatar
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    Junior Member chalcogen's Avatar
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    Quote Originally Posted by Kalki View Post
    Any ideas about the gene-groupings? What causes them? Are there any other groups/cluster of genes that heavily correlate?
    It's called genetic linkage. It boils down to the principle that genes that are close to each other on a chromosome are more likely to be inherited together. I don't know enough about the specifics of hair and eye color to tell you more or say that's responsible for the trend you think you're seeing, but that's what the concept you're talking about is called. Multiple genes influence hair, eye, and skin color, so yeah maybe some of them are in a linkage group. It'd be interesting to look into for sure.

    I've also heard that men tend to have darker skin than women, but I don't know the mechanism behind it. Even if you inherit a certain version of a gene, how that gene is expressed and whether it is expressed at all can actually be modified by a variety of factors. Maybe there are specific gender-related differences in that which on average work out to give women lighter skin by affecting how much melanin they produce, so that will affect hair and eye color.

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