The three types of cones are called red, green, and blue, but each actually detects a range of wavelengths and not these specific colors. Some of the eye color genes include EYCL1 (a green/blue eye color gene located on chromosome 19), EYCL2 (a brown eye color gene) and EYCL3 (a brown/blue eye color gene located on chromosome 15). I could imagine that it might serve as a kind of reflector for some of the sun so that our eyes might not get over exposed, but that doesn,´t explain the myriad of colors that our eye has. The color of the skin is a shade of chocolate-brown or black, and the eyes are very dark brown or black. The color of human eyes is not dictated by a single gene like many of the other traits. Answer Save. Or white people in the same family having different hair and eye colour, ranging from blonde/blue-eyed to auburn/green-eyed? It is instead considered a polygenic trait, meaning there are several different genes on various chromosomes that carry information about what eye color an individual should possess. Favorite Answer. Through natural selection, different types of eyes have emerged in evolutionary history -- and the human eye isn't even the best one, from some standpoints. The visual pigment families include the following: 1. Why are some black people, born to the same parents, without any mixed ancestry, have different shades of brown skin, ranging from light tan to chocolate? Lv 4. Considered everything from the source of all light to a true window into someone’s soul, the eyes convey our emotion, purpose, and much more. The beard in males is well developed, as is the hair upon the body and the eyebrows.

The hair is usually raven-black, not woolly, but fine and silky in texture, wavy, and long. Scientists aren't entirely sure why we kept this hair, but they have a pretty good guess. The … Posted on June 30, 2016 by MAMcIntosh. This allows light to reach the fibres of the stromal cells beneath, and they reflect light back as blue. We know that eyebrows help keep moisture out of our eyes when we sweat or walk around in the rain. The epicanthic fold is often associated with greater levels of fat deposition around the eyeball, a feature most accentuated in native North Siberian, Aleut and Inuit populations. The eye begins as a cyst, fully ... are important to understand especially as we follow color vision along the evolutionary trail. So, our brains subconsciously note that as a sign of femininity. Eye color is a bit complex when talking about genetics. Rods detect light and dark and help form images under dim conditions.Cones are responsible for color vision. There are roughly 7 broad categories of eye color in the world. In analysis of European haplotypes of these two SNPs and in transmission-disequilibrium tests using rs1407995*C/T, there was an effect on eye color, but not skin or hair color. Color blindness or deficiency, means your photopigments are abnormal causing your color perception to be limited and inaccurate. I recall hearing at some point that the gene for eye color is tied to the gene that controls the amount of melanin in the skin. Seeing the 'Future' "The brain … By Azriel ReShel / 06.30.2016 . The evolution of human colour vision in Homo sapiens produced a trichromatic view of the world in comparison to a majority of other mammals that only have a dichromatic view. The arch shape diverts the rain or sweat around to the sides of our face, keeping our eyes relatively dry. The amount of color contrast around the eyes and lips. Evolution does not have a purpose. The more color contrast between a woman’s eyes and lips and her skin tone, the more feminine—and thus evolutionary attractive—she is seen to be. Women naturally tend to have darker lips and skin around the eyes. 4 Answers. The coating on the interior back of the eye is called the retina.When light strikes the retina, two types of cells are activated. They are often hindered by two evolutionary constraints: 1) high predation pressure, this being a constraint on color traits in general, and 2) presence of related species within the same geographic range, apparently because too much intraspecific variability makes it harder to recognize one's own species and leads to hybridization.