"CravenLestat;c-16375084" wrote:
Before posting for the record this fella here typing, meaning me is a blue eyed left handed ginger.My father is ginger my fathers sister,my grandmother, 3 out of 5 of my brothers children are ginger, my fathers mother..................... My family is Irish not Scottish but Ireland has I believe the 2nd highest redhead percent.
Anyway
https://www.simplemost.com/rarest-hair-eye-color-combination/
In this article you will see
To put it in perspective, you’re more likely to get struck by lightning—.03 percent chance—than you are to meet a person with red hair and blue eyes (coming in at .017 percent).
https://www.rd.com/health/beauty/hair-eye-color-combination-rare/
Redhead facts which you can google anywhere you will get same results
https://www.usatoday.com/story/news/nation-now/2016/11/05/redhead-day-9-fun-facts-red-hair/93341504/
And yes please go nerd stat on a nerd,it is what we do. :smirk:
@CravenLestat Well, if you insist...
Article #1 is a total crock. First of all, the article has some terrible math, multiplying 17 percent and 1 percent together to get .017
percent..17 x .01 = .0017, or .17 percent, meaning the rate cited in the article is off by a factor of 10.
But more importantly, the various articles just multiply the percentage frequencies together, which would only work if one of the traits were precisely evenly distributed throughout the entire world. In that case, any person with blue eyes would have exactly the same statistical chance of being a redhead as any person with brown eyes, but this is clearly not the case, as billions of people in South and East Asia have brown eyes and an effectively zero chance of red hair. (People of Sub-Saharan African ancestry have a slight chance of red hair due to a condition called rufous albinism, but that's a whole different discussion.) On the other hand, populations in Ireland and Scotland have high frequencies of both traits, making their co-occurrence much more likely. This drives up the total number of red haired, blue eyed people considerably compared to what you would see if the traits had no relationship with each other.
To put it another way, if I could play god the way I do with my sims, and I created the traits of green hair and white eyes in a very small number of people, I could say, look, the chances of them occurring together are almost zero. If the traits each occurred in only one person per million, there would be a less than 1% chance that even one human on the planet would have both. But what if I imposed those two traits on the
same 7,000 people? Then there would be 7,000 with both in generation one. And what if I put them all together somewhere relatively isolated, so that they often married each other? A few generations in, even with a good amount of mixing with other populations, there would likely still be several hundred people in the world with both traits, even if the overall rate of each trait was still one-in-a-million.
As far as handedness is concerned, I didn't find the stats I was looking for, but its genetic basis has yet to be completely described, so neither can its biological relationships (if any) with the various ginger genes. (Yes, there are several, although the
melanocortin 1 receptor gene on chromosome 16q24.3 is the most commonly described.) From the way the third article was phrased, "Having red hair isn't the only thing that makes some redheads unique. They are also more likely to be left handed. Both characteristics come from recessive genes, which like to come in pairs," I think it means more likely then the general population, as in, more than 10% of gingers are also lefties, but not necessarily more than 50%. Also, from what I remember reading many years ago, Scotland has a higher rate (maybe 15%? and even up to 25% in certain villages?) than normal of lefthandedness, so again, if the traits all exist together at greater frequency in one population, that will skew the overall rate of co-occurrence. In the end, though, the fact that this article said that recessive genes
like to come in pairs should be a giant red flag warning us off taking anything else it says at face value.
Sorry @Mikezumi for getting carried away. But I like population genetics in general, and one of my favorite things about TS3 is seeing sim traits get passed down through the generations. (That's maybe why I slightly prefer Euan, as his red hair is more rare, so it feels like he's wearing a badge of his inheritance.) I always give my founding sim(s) a unique trait, just so I can watch it crop up again and again throughout the town as the family branches out.
