What Color Eyes Would Your Child Have
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SCIENCE — Life Science
Have You Ever Wondered...
- What determines the color of your eyes?
- What are the two main genes associated with eye color variation?
- What is heterochromia?
Today's Wonder of the Day was inspired by julia. julia Wonders, "What Determines Eye Colour?" Thanks for WONDERing with us, julia!
If the eyes are the windows to the soul, then what color are your windows? Baby blue? Big and brown? Green or hazel? Have you ever WONDERed about how your eyes came to be the color they are?
Did your parents pick out the color of your eyes? Not exactly, but they did play a big part in determining their color. How? They passed along their genes to you!
There are two main factors that help determine your eye color: the amount and pattern of dark brown pigment (called melanin) in the part of your eye called the iris and the way in which the iris scatters light that passes through the eye. The more important factor is pigment, which is determined by your genes.
Deep inside the nucleus of your body's cells are 46 chromosomes, divided into 23 pairs. When you were conceived, you inherited one chromosome from each parent to make each pair of your chromosomes.
Chromosomes are comprised of pieces of DNA called genes. These genes, which also come in pairs, determine many of your characteristics you will develop. Scientists believe that as many as 16 different genes could play a role in determining eye color. The two main genes believed to be responsible are OCA2 and HERC2, both of which are part of chromosome 15.
Genes are, in turn, made up of alleles that ultimately determine whether any particular characteristic will appear. For each trait you can inherit, there are two alleles. If the two alleles are the same, they are homozygous. If they are different, they are heterozygous. For each trait, one allele (dominant) is expressed (the trait it represents appears), while the other allele (recessive) is unexpressed (the trait it represents does not appear). Recessive alleles are only expressed if there is no dominant allele present.
For example, the alleles for eye color can be separated into blue, green, and brown. Green alleles are dominant over blue alleles, and brown alleles are dominant over both blue and green alleles. If you received a blue allele and a brown allele, your eye color would be brown because brown is the dominant allele. If you have blue eyes, that means you received blue alleles from both parents.
Your genes also determine your eye color by dictating how much (and where) melanin is produced in your iris. The more melanin produced, the darker the eye color will be. Because melanin production does not begin at birth, babies' eyes appear blue. True eye color will be determined over time. It's usually not until age three that a child's true permanent eye color reveals itself.
Have you ever noticed how some people's eyes seem to change color depending upon the lighting? That occurs because the iris has two layers. Sometimes there is pigment in both layers. In people with blue or green eyes, however, the front layer will have very little or no melanin. Depending upon the amount and diffraction of light, their eyes may appear to change colors.
Some people have two different eye colors. This results from a condition called heterochromia. It's very rare, but usually harmless. It occurs due to differences in the early stages of iris development.
Wonder What's Next?
Join us in Wonderopolis tomorrow as we take a look at technology without seeing it!
Try It Out
Whether you're a boy with baby blues or a brown-eyed girl, you'll have fun exploring the following activities with a friend or family member:
- You've probably seen plenty of people with blue, brown, and green eyes. But what about red, purple, or orange? What do you think the world would be like if people could have eye colors in those shades? Would you trade your current eyes for a pair of yellow ones? Or another exotic color? Why or why not?
- Did you know that some actors change their eye color for different acting roles by using special colored contact lenses? If you could change your eye color, which color would you choose? Why? Compare your eye color to that of your friends and family members. How many different shades of eye color can you see? Which is your favorite?
- Did you beat the odds when it comes to eye color? Go online to try out the Baby Eye Color Predictor Calculator. Plug in your parents' eye colors and see what the calculator says about what color your eyes should be. Compare the results to your actual eye color. How do they compare? Share this information with a friend and try it out with a few other people.
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Wonder Contributors
We'd like to thank:
Alana
for contributing questions about today's Wonder topic!
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Question 3 of 3
If you received a blue allele from your mother and a brown allele from your father, what color eyes will you have?
- a red Not Quite!
- b green Not Quite!
- c brown Correct!
- d blue Not Quite!
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What Color Eyes Would Your Child Have
Source: https://wonderopolis.org/wonder/what-determines-the-color-of-your-eyes