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Thread: The Most Recessive Phenotypes

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    The Most Recessive Phenotypes

    I read on wiki that red hair is recessive to blonde, so if this is right does that mean that red heads with blue eyes and very fair skin will be the first to disappear if things continue as is?

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    Quote Originally Posted by Den groda View Post
    I read on wiki that red hair is recessive to blonde, so if this is right does that mean that red heads with blue eyes and very fair skin will be the first to disappear if things continue as is?
    Poeple tend to think that it would be Nordid, but it's not. Nordid phenotype is dominant over Cromagnoid/Neanderthal phenotype, that it be toward the hair texture, hair colour, body built, muscular structure et alii.

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    Would depend on what you are calling "Red".

    I have seen many Latinos with what could be called "red hair".

    Although I'm not a geneticist, I think as a general rule light is recessive to dark.

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    Are green eyes recessive to blue eyes? I know they're considered darker and closer to brown, but they're also the most rare (I believe).

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    No green eyes are dominant to blue, but they are rarer.

    EQ the type of red hair I am thinking of is that pretty much exclusively seen on Germanics.

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    Quote Originally Posted by Den groda View Post
    I read on wiki that red hair is recessive to blonde, so if this is right does that mean that red heads with blue eyes and very fair skin will be the first to disappear if things continue as is?
    Just becoming more rare. Because even recessive traits reappear in the following generations if just two copies of the same gene come together (homozygous).

    You can observe that in mulatto-populations even, it's just much rarer than the dominant dark coloration than.

    In a population which is 50 : 50 with light : dark you can say that about 25 (homozygous light) percent will be light and 75 percent dark if all breed by chance.
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    Red hair is not recessive to blonde, it is recessive to what is dominant as "non-red hair". Blonde is recessive to brown hair, whilst natural (rather than age-caused) gray hair is recessive to pitch-black hair.

    As regards phenotypical recessivity, it all depends how far we want to go. If we had to pick a Europid sub-racial phenotype, arguably Borrebies, Faelids and Baltids have a tendency to be the most recessive. That is already considering that having a square facial shape is recessive, whilst oval shape is dominant.

    If we assumed that recessivity is most favourable for a colder climate, then this would actually already mean that Cro-Magnids would be naturally more acclimatised to the cold, but then again we know of the Mediterranoid origin of the Atlantonordoid types, whose lesser adaptibility is already explained by other pointers such as predominantly ectomorphic-leptomorphic and mesomorphic physique, so well...

    If he also has slender but conjoined eyebrows, attached earlobes, round eyes, short eyelashes, no freckles and no widow's peak then this person would then arguably be classed as the most recessive, at least as far as facial features are concerned.
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    Thanks for your replies it seems I was wrong.
    Got this all from the net:

    Red hair is the rarest natural hair colour in humans

    Two types of pigment give hair its color: eumelanin and pheomelanin.

    Pheomelanin colors hair red. Eumelanin, which has two subtypes of black or brown, determines the darkness of the hair color.

    Blond hair can have almost any proportion of pheomelanin and eumelanin, but both only in small amounts.

    Red hair is characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin

    The genetics of red hair, discovered in 1997, appear to be associated with the melanocortin-1 receptor (MC1R), which is found on chromosome 16.
    Red hair appears in people with two copies of a recessive gene on chromosome 16 which causes a change in the MC1R protein.

    The Red Hair Gene and Mutations in the Mcr1 Gene

    Red hair operates a little differently than the other colors. Pheomelanin is the important pigment in operation here and Mcr1 is the gene that controls it.
    For people with two normal copies of Mcr1, pheomelanin production is stifled and hair is whatever color the other genes dictate: black, brown or blonde.
    When an abnormal Mcr1 gene is there, pheomelanin runs free, giving a red tint to everything. There are actually nine known variants of abnormal Mcr1, any of which can combine together to influence hair color.
    When this comes into play, the red color interacts with the other hair colors to give different shades of red. Two altered Mcr1 genes often brings out a strong red color, except for when high levels of black eumelanin cover it up. A single altered Mcr1 gives enough pheomelanin to tint blonde hair into strawberry blonde, but usually not enough to overcome black or brown color visually.

    Q:
    I know that the genes for red hair and for blonde hair are both recessive. What is the likely hair color if a blonde and a red head have a child?

    A:
    The short answer is, probably strawberry blonde. There are some unusual factors to consider here.
    Red hair is not actually a recessive gene (like blonde is), but is rather an "incomplete dominant." In the world of genes, there are dominant genes, which take over any recessive gene (brown, black), recessive genes (blonde), which will be taken over by any dominant gene, or incomplete dominent genes (red). Incomplete dominant genes will "blend" with any dominant, recessive or other incomplete dominant gene. I, for example, have "auburn" hair, which is essentially red blended with brown. Strawberry blondes are red blended with blonde.
    So you've got yourself a red headed parent (let's call those genes aa) and a blonde parent, which we'll represent as bb. 100% of the offspring will have one hair color gene from each parent, or ab. This means red and blonde. Since red will always blend with other genes, the resulting hair color should be a blend of blonde and red, or strawberry blonde. In the case of my parents, which both have brown hair (let's call the brown/black genes C), either one parent or possibly both are carrying one "a" in addition to their brown or black genes, with the possibility of even a blonde thrown in (CC, Cb, or Ca). My parents are probably (Ca, CC). I'm probably a Ca, or a blend of brown and red. This result has an outcome likelihood of 50%.

    So the people with the greatest threat to extinction are blue eyed blondes with fair skin, but the rarest combination is a green eyed red head with fair skin.

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    Can eye colour be incomplete dominant?

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