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The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
Amber eyes have a beautiful, solid gold hue that never falters. 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 ...
Cicadas with blue eyes. Cicadas have blue eyes because they are mutants. The University of Connecticut observed that some periodical cicadas have blue or white eyes, or some may lack red ...
NBC Chicago reports, "Experts said blue-eyed cicadas have been seen before, but such sightings are rare. "One in a million," said Dr. Gene Kritsky, dean of Behavioral and Natural Sciences at Mount ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical ...
The inheritance pattern followed by blue eyes was previously assumed to be a mendelian recessive trait, however, eye color inheritance is now recognized as a polygenic trait, meaning that it is controlled by the interactions of several genes. [57] Blue eyes are predominant in northern and eastern Europe, particularly around the Baltic Sea.
Blue eyes are also found in parts of Western Asia, most notably in Afghanistan, Syria, Iraq, and Iran. [53] In Estonia, 99% of people have blue eyes. [54] [55] In Denmark in 1978, only 8% of the population had brown eyes, though through immigration, today that number is about 11%. [55] In Germany, about 75% have blue eyes. [55]
Hazel eyes tend to change colors due to Rayleigh scattering—the same factor that makes the sky appear blue. This optical effect occurs in the stroma, which is a thin layer of tissue in front of ...