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2. Eye color - Wikipedia

   en.wikipedia.org/wiki/Eye_color

   Eye color is an inherited trait determined by multiple genes. [14] [15] These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs. The total number of genes that contribute to eye color is unknown, but there are a few likely candidates.

3. Martin–Schultz scale - Wikipedia

   en.wikipedia.org/wiki/Martin–Schultz_scale

   The scale consists of 20 colors [1] (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris (in this case, the lower the number, the lighter the eye color): [2] [3] 1-2: blue iris (1a, 1b, 1c, 2a : light blue iris - 2b: darker blue iris) 3: blue-gray iris

4. Martin scale - Wikipedia

   en.wikipedia.org/wiki/Martin_scale

   The original Martin scale, summarized below, consists of 16 colors (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris. The numbering is reversed in order to match the Martin–Schultz scale, which is still used in biological anthropology. In this case ...

5. How Rare Are Hazel Eyes, Exactly? - AOL

   www.aol.com/rare-hazel-eyes-exactly-100600193.html

   Related: The Rarest Eye Color in the World: What It Is and Why. What Causes Hazel Eyes? Eye color is determined by the amount and distribution of melanin in the iris of the eye, in addition to the ...

6. The Rarest Eye Color in the World: What It Is and Why

   www.aol.com/lifestyle/rarest-eye-color-world-why...

   Grey eyes make up about 3 percent of the world's population—the second rarest eye color. There are also rare cases of violet and red-colored eyes. What Determines Eye Color?

7. Heterochromia iridum - Wikipedia

   en.wikipedia.org/wiki/Heterochromia_iridum

   Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]

8. How Rare Are Green Eyes, Exactly? - AOL

   www.aol.com/lifestyle/rare-green-eyes-exactly...

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9. Monochromacy - Wikipedia

   en.wikipedia.org/wiki/Monochromacy

   Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.