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Only 13 million in the world: it's the rarest hair and eye color combination - Walla! health

2022-05-15T04:43:37.314Z

Many people look at people with blond hair and blue eyes as the perfect combination, but the truth is that there is one combination that is truly special, and is totally admirable



Only 13 million in the world: it's the rarest hair and eye color combination

Many people look at people with blond hair and blue eyes as the perfect combination, but the truth is that there is one combination that is truly special, and is totally admirable

Walla!

health

15/05/2022

Sunday, 15 May 2022, 07:13 Updated: 07:37

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All parents like to think their child is special, but does your child have the rarest combination of hair and eye colors ever?

And no, we are not talking about blue eyes and blond hair.



The title of combining hair color and the rarest eye color belongs to redheaded people with blue eyes.

According to Medical Daily, both blue eyes and red hair are recessive traits, so the likelihood of the two traits appearing together is actually quite slim.

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Redhead hair alone occurs in a frequency of 1 to 2 percent of the human population, which is why every year someone raises the concern that the redhead gene is about to become extinct from the world.

Blue eyes, on the other hand, appear in about 17 percent of the world's population.

Technically, this means that 0.17 percent (or about 13 million people) of the world's population have red hair and blue eyes.

But since a number of factors affect the likelihood of this combination, it is difficult to confirm this statistical calculation.

A very rare combination.

Actress Emma Stone (Photo: GettyImages, Venice Film Festival)

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Every trait in our body, like hair color, eye color, nose shape and other characteristics, are encoded in a genetic unit called a "gene".

Each gene is made up of two DNA fragments called alleles - one we got from mom and one from dad.



Alleles can be dominant or recessive, and just like humans, the dominant ones are expressed at the expense of the recessive ones.

The allele that encodes the reddish hair color is recessive, so if I inherited the redhead allele from my mother and my father a dominant allele for black hair color, I would have black hair, because that is the allele that would manifest.

Only if I inherited from my parents two reddish alleles, will they manifest and my hair color will be orange.



During evolution certain traits undergo natural selection.

Some are extinct while others are thriving and passing on to future generations.

But the choice can only work on features that are expressed.

Therefore dominant traits undergo a much simpler natural selection and can become extinct more easily.

Recessive traits, however, can remain "dormant" for many generations, and they will affect an individual's chances of having offspring only in the few cases in which they are manifested.

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Source: walla

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