Baby eye color calculator

Eye color calculator

Click on each character to select the color of his eyes

Eyes color : Undefined
Eyes color : Undefined
Eyes color : Undefined
Eyes color : Undefined
Eyes color : Undefined
Eyes color : Undefined

Baby eye color

How it works

The determination of the eye color of an individual is a complex and fascinating phenomenon, especially when the birth of a new child approaches.

What color would my child's eyes be?
What are his chances of having brown, blue or green eyes?

The following answers are simplified explanations, the determination of the eye color of an individual depends on much more parameters than those cited below.

This method of calculation takes into account only three theoretical eye colors: brown, green and blue. The results given by this calculator are an estimate of the chance of having a child with the eyes of one of these three colors.

Two principal genes are detected as determinants for eye color: EYCL3 (localized on chromosome 15) and EYCL1 (localized on chromosome 19). The EYCL3 gene determines the amount of melanin present in our eye color, light eyes or dark eyes. Its value can be: B (Brown) or b (blue). The EYCL1 gene determines the blue color or green color of our eyes. Its value may be: G (Green) or b (blue).

On each chromosome, we have two different alleles that come from our mother AND our father.

These genes have a dominance / recessivity ratio between them, that is, some genes will override others. The B gene is dominant on the b gene, and the G gene is dominant on the b gene. The b gene is always recessive.

For example, an individual with brown eyes may have the combination:

Chromosome 15 (EYCL3 gene): Allele 1 => B, allele 2 => b, dominant gene => B

Chromosome 19 (EYCL1 gene): Allele 1 => b, allele 2 => b, dominant gene => b

The color determined by the EYCL1 gene is blue, but that determined by the EYCL3 gene is brown. Finally, this individual would have brown eyes because the gene EYCL3 (having value B) will be dominant on the EYCL1 gene (having value b).

The notion of "undefined" color corresponds to an individual whose eye color is unknown. This means that he can possess one of the sixteen possible combinations that can determine the color of his eyes.

Of the sixteen possible combinations: twelve correspond to the brown color, three to the green color, and one to the blue color.

Here are the sixteen possible combinations:

BB bb => BROWN
Bb Gb => BROWN
Bb bG => BROWN
Bb bb => BROWN
BB bb => BROWN
Bb Gb => GREEN
Bb bG => GREEN
Bb bb => BLUE

When we know the color of an individual's eyes, we can determine the possible combinations corresponding to him. The chromosomes of baby will be made up of one or the other of the alleles of each of the parents.

We can therefore calculate all the possible combinations determined by the eye color of each parent.

For example:

- For two parents with brown eyes, the number of possible combinations is 331776 !!!

- For two parents with blue eyes, the number of possible combinations is now only 16 (but all equal to "bb bb").

Using this method of calculation, we find that two parents with blue eyes and / or green eyes can not have a child with brown eyes. Whereas in reality this could happen! Even if the possibilities are minimal, they prove the limits of this method of calculation.

It is for this reason that the calculator is "rigged" when the final result is displayed, in the event that both parents have green and or blue eyes, to indicate a minimum percentage of chance that the child could have brown eyes.