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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.
Blue, brown, hazel, green and all of the shades in between—there is one in the list that a small two percent of the population hold. Can you guess what the rarest eye color in the world is?
The historic dual cicada emergence continues across Illinois. As we come eye to eye with these insects, the revelation is prompting people to ask about the way these things look. Here are a few ...
Blue eyes actually contain no blue pigment. The colour is caused by an effect called Tyndall scattering. Blue eyes do not actually contain any blue pigment. Eye colour is determined by two factors: the pigmentation of the eye's iris [48] [49] and the scattering of light by the turbid medium in the stroma of the iris. [50]
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.
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 ...
The two blue-eyed people, seeing only one person with blue eyes, and that no one left on the first dawn (and thus that k > 1; and also that the other blue-eyed person does not think that everyone except themself are not blue-eyed [() ()], so another blue-eyed person () ()), will leave on the second dawn.
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 ...