Why Do People Have Different Eye Colours?

Why Do People Have Different Eye Colours?

You may wonder what causes people to have different eye colours. In one family, you could have 4 different shades between 4 different members, and this all comes down to genetics. There are a whole host of colours in the spectrum, which include black, brown, hazel, amber, blue, green, grey, and even violet.  The colour of your eyes will be a trait which is passed down through your family bloodlines, and the colour you receive is all down to your genes.


What Eye Colours Are The Rarest?

As with everything in the world, some things are more common than others, and the colours of people’s eyes are no exception. The rarest eye colour in the world is green, with just 2% of the world population having them. This is closely followed by blue, which 8% of the world's population has. Green and blue eyes occur when they eye lacks pigment which makes them brown. Blue eyes are caused by a recessive gene, and when combined with red hair makes the combination the rarest in the world.

What Eyes Colours Are Most Common?

The most common eye colour in the world is brown, with over 55% of the world's population having them.  Of these 55%, almost 100% of Africans and Asians have brown eyes, making it a dominant trait in these ethnicities. Variants of brown include Hazel and amber, both of which are extremely rare colours.

How Does Genetics Work?

Eye colours are determined by the genes of both parents. It can become quite confusing at times, especially if 2 brown eyed parents have a blue-eyed child. This happens when both parents carry the recessive blue-eye gene, which can result in a blue-eyed child. Likewise, 2 blue-eyed parents may carry the brown-eye gene and produce a brown-eyed child. For blue and green eyes to occur, both parents need to carry the gene, otherwise, it will not occur. If only one parent carries the blue-eye gene, then it is a virtual impossibility to produce a blue-eyed child. This is the same for hair colour and the red hair gene.

In some African and Asian families, the blue-eyed gene can appear from more than 7 generations ago should 2 genetic lines have the trait. This can prove to be somewhat surprising, yet creates a beautiful appearance. Your eyes come from many bloodlines, and their final colour all depends on the genes your parents pass on to you.

 

 

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