Eye colours and Disney

 

Have you seen the movie Frozen? Love all the songs and dance? Had a good laugh watching the snowman make a fool of himself? Enjoyed watching all the heart warming moments between the 2 sisters Elsa and Anna? Some fan theory floating around the internet that may just burst your bubble. Rapunzel is possibly Elsa’s sister!

Image result for frozen elsa anna eye

Fans who watched the movie -Frozen, would have seen a glimpse of Rapunzel visiting Elsa and Anna, which does prove that they all live in the same movie realm. While this article is not meant to spoil the movie, nor delve into the fan theory, we will attempt to understand a bit more about eye colours. Eye colours come in many shades, from brown, blue grey, and green. What makes the eye colours different? Well, generally, it is the amount of melanin in our eyes, that when seen together with oue eye’s collagen fibers, creates the colour of the eye.  More specifically, the colour of the iris. The eye is brown when there is a high amount of melanin, becoming progressively more blue with less melanin present. This blue or brown eye character is decided from birth, and based on what gene the child has gained form the parents, it will determine if he/she has blue or brown eyes.

 

But that’s not all. In recent studies, we also know that there is another gene that influence if the eyes are green or blue. So all in all, there are 2 pieces of genes that determine our eye colours.

 

A quick recap on genetics. We all have 2 copies of our genes in us. When we become a parent, we give one of that copy to the kid. So the child inherits two different sets, one from the father and one from the mother. The blue/ brown eye colour genes (also known as OCA2 and HERC2), and the blue/ green eye colour gene are passed on to the child. However, not all these genes have the same priority. There is a concept called “dominant gene”, whereby certain genes have greater impact on the characteristic, and display itself when present. For example, if the black hair gene is dominant over the blonde hair gene, and the child has one black, one brown gene, the black hair will show on the child.

 

Interestingly because for eyes, there are 2 pieces of genes that determine colour, the below combination occurs.

Image result for eye colour genetics

Back to the movie. Elsa’s father has green eyes, and Elsa’s mother has blue eyes. That would mean that these parents have a 50% chance of a green eye child, and a 50% chance of a blue eye child. Elsa has blue eyes, so that’s fine. But interestingly enough, Rapunzel’s parents are also one blue eye, and one green eye, and Rapunzel has blue eyes. Coupled with many other interesting evidences, it does seem possible that this fan theory is true. At the very least, we can’t use genetics to prove that it’s false! 🙂

 

Take a look at the fan theory:

References:

  1. Referenced from: http://static.tumblr.com/2786db9a0f2cf5c6dbd66e1ba150fc95/tk5iymv/Lbomz7naf/tumblr_static_disney-frozen-fb-cover-photo-elsa-and-anna-fb-cover1.jpg
  2. Referenced from: https://s-media-cache-ak0.pinimg.com/originals/c0/0f/a2/c00fa2bc58b5ce49f4b9e865e408b5e6.png
  3. Referenced from: http://www.gbhealthwatch.com/Trait-Eye-Color.php
  4. Referenced from: http://genetics.thetech.org/how-blue-eyed-parents-can-have-brown-eyed-children

 

 

 

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5 thoughts on “Eye colours and Disney

  1. Hey Samuel, this post is pretty much similar to my previous posts on eye colours. I like how the presence of dominant/ recessive gene being responsible for the eye colour is is accentuated in this post. It’s interesting isn’t it?

    However, besides genes, there are other factors too that affect the eye colour such as the composition of stroma in the iris and lighting conditions.

    Like

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