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What makes hazel eyes?
Hazel eyes Pigmentation Genetics
Questioner：Sophia Lee 2023-04-06 14:04:04
The most authoritative answer in 2024
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Emma Johnson——Studied at Stanford University, Lives in Palo Alto, CA
Hello, I'm an expert in genetics and human eye color. Let's dive into the fascinating world of what makes hazel eyes.
Hazel eyes are a beautiful blend of colors, typically a mix of green and brown. The color of our eyes is determined by the amount and type of pigments in the front part of the iris, as well as by the scattering of light by the turbid medium in the stroma of the iris.
Hazel eyes are a result of a moderate level of pigmentation in the iris, which is influenced by multiple genes.
Here's a step-by-step breakdown of what contributes to the formation of hazel eyes:
1. Pigmentation: The amount of melanin, the pigment responsible for the color in our eyes, skin, and hair, plays a crucial role. Hazel eyes have a moderate amount of melanin, which is less than what's found in brown eyes but more than in blue or green eyes.
2. Genetics: Eye color is a polygenic trait, meaning it's influenced by multiple genes. Several genes have been identified that contribute to eye color, with the OCA2 and HERC2 genes on chromosome 15 being particularly significant.
3. Rayleigh Scattering: This is a phenomenon that affects the way light is scattered in the stroma, which is the connective tissue in the iris. The scattering of light can affect the perception of eye color, making hazel eyes appear to have a mix of colors.
4. Distribution of Pigment: In hazel eyes, the melanin is not evenly distributed throughout the iris. This uneven distribution creates the characteristic variegated appearance.
5. Lighting Conditions: The perception of hazel eyes can change under different lighting conditions, which can make the green and brown hues more or less prominent.
To sum up, hazel eyes are a complex interplay of genetics, pigmentation, and the physics of light scattering.
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Ethan Patel——Works at the International Renewable Energy Agency, Lives in Abu Dhabi, UAE.
Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green.read more >>+119962023-04-07 14:04:04
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